California Statewide Study of People Experiencing Homelessness: All Related Resources

Are you a researcher who wants to include people with lived experience in your research? Are you an organization that wants to authentically involve community members in your program development or evaluation? The UCSF BHHI recently released a report on the largest representative study of homelessness in the United States since the mid-1990s—the California Statewide Study of People Experiencing Homelessness (CASPEH). The CASPEH was guided by a Lived Expertise Advisory Board—a group of advisors from across the state of California who represent a range of lived and living experiences of homelessness. Join Kara Young Ponder, PhD, Lived Expertise Advisory Board Members Michelle Ochoa, Dez Martinez, and Robynne Rose-Haymer as they discuss the nuts and bolts of how they did research together from designing survey questions to helping train field staff, analyzing data and disseminating findings. 

Margot Kushel, MD, director of the Benioff Homelessness and Housing Initiative, delivered the Harvard Joint Center for Housing Studies’ 23rd John T. Dunlop Lecture. Dr. Kushel spoke about the impact that homelessness has on an individual’s quality of life, highlighting the lived experiences of unhoused Californians who participated in the California Statewide Study of People Experiencing Homelessness. After the lecture there was a panel, featuring, Boston Healthcare for the Homeless founder, Harvard Medical School professor James J. O’Connell, and Peggy Bailey, a leader of a housing policy research center. JCHS Managing Director Chris Herbert, the moderated the panel. Dr. Kushel said, "While it is really easy to blame people impacted by homelessness, doing so not only is not fair or right, but it also isn’t going to get us any closer to a solution."

Black Californians make up only 7% of the states population, but make up more than 25% of the state's population of people who experience homelessness. A recent special report released by the UCSF Benioff Homelessness and Housing Initiative on Black Californians' experiences homelessness highlights the systemic racism. Kara Young Ponder, PhD, director of community engagement and racial justice at the UCSF Benioff Homelessness and Housing Initiative, said, "California is one million units short of affordable and available housing for extremely low-income renters, of which Black Californians are over represented."

Black Californians are nearly four times more likely than White Californians to experience homelessness. This webinar is about the causes and consequences of homelessness for Black Californians. Kara Young Ponder, PhD, Tiana Moore, PhD, Lived Expertise Advisory Board Members Sage Johnson and Robynne Rose-Haymer, and National Alliance to End Homelessness VP of Research and Evidence Joy Moses discussed findings from the California Statewide Study of People Experiencing Homelessness (CASPEH), highlighted key policy recommendations, and answered audience questions.

To better understand the experiences of Black Californians experiencing homelessness, the UCSF Benioff Homelessness and Housing Initiative examined the experience of Black Californians within the California Statewide Study of People Experiencing Homelessness (CASPEH), the largest representative study of homelessness since the mid-1990s. This report reviews who experiences homelessness in the Black community, what may have precipitated their homelessness, experiences during their episode of homelessness, and what impacts their return to permanent housing. These findings aim to inform evidence-based solutions for preventing and ending homelessness for Black Californians.

The University of California, San Francisco Benioff Homelessness and Housing Initiative (BHHI) today released a special report on Black Californians’ experiences of homelessness. The report explores who in the Black community experiences homelessness, how they lost their housing, their experiences while homeless, and the barriers they face to regaining housing. The goal of the report is to inform evidence-based solutions for preventing and ending homelessness for Black Californians.

Hosted by the California Partnership to End Domestic Violence (the Partnership), lead researcher Anita Hargrave, MD, BHHI Policy Director Tiana Moore, PhD, and CPEDV staff dove deeper into policy recommendations and solutions that arose from the California Statewide Study of People Experiencing Homelessness (CASPEH) findings on the intersection of intimate partner violence and homelessness. The webinar featured an in-depth discussion of local and state opportunities, as well as funding and programmatic policy recommendations for advocates, policymakers, and other decision-makers.

A special report on the relationship between intimate partner violence and homelessness in California by the UCSF Benioff Homelessness and Housing Initiative, found that 1 in 5 women who become homeless in California flee their homes to escape violence. Participants described the need to plan their exit in advance and to accumulate resource; however, of those who experienced intimate partner violence in the 6 months prior to homelessness, only 12% sought help from a domestic violence organization. Margot Kushel, MD, director of the UCSF Benioff Homelessness and Housing Initiative, said, "Some people honestly had no idea what is a domestic violence shelter. Other people told us when they had to run, they had to run. They didn’t have time to figure out where to find a shelter."

A special report, released by UCSF Benioff Homelessness and Housing Initiative, explored the relationship between intimate partner violence (IPV) and homelessness in California. Findings from the report showed how violence and economic insecurity can be intertwined. Margot Kushel, MD, director of the UCSF Benioff Homelessness and Housing Initiative, said, "There are only so many places you can hide when you’re unsheltered."

Domestic violence, frequently referred to as intimate partner violence (IPV), is a common precipitant of homelessness. This webinar is about the intersection of intimate partner violence and homelessness. Anita Hargrave, MD; Lived Expertise Advisory Board Members Jesica Giannola and Dez Martinez; Tiana Moore, PhD, and Debbie Chang, MPH, CEO of the Blue Shield of California Foundation discussed relevant findings from the California Statewide Study of People Experiencing Homelessness (CASPEH), highlighted key policy recommendations, and answered audience questions.

To better understand the experiences of survivors of intimate partner violence currently experiencing homelessness, this report analyzed data related to IPV in the California Statewide Study of People Experiencing Homelessness (CASPEH)—the largest representative study of homelessness since the mid-1990s. The mixed-methods study included data about participants’ experiences of violence across the life course, in the six months prior to homelessness, and during their current episode of homelessness. The report presents these findings to advance evidence-based solutions for preventing and responding to homelessness among survivors of IPV. 

SAN FRANCISCO – The University of California, San Francisco Benioff Homelessness and Housing Initiative (BHHI) today released a special report on the relationship between intimate partner violence (IPV) and homelessness in California. The analysis is based on survey data and in-depth interviews from the California Statewide Study of People Experiencing Homelessness (CASPEH), the largest representative study of homelessness in the United States since the mid-1990s.

A growing number of people with lived experience of homelessness are finding opportunities in California to influence academic projects. More entities are beginning to create entire boards or councils of people who know what it is like to lose their housing. With regards to including a lived expertise advisory board in UCSF BHHI's California Statewide Study of People Experiencing Homelessness, Kara Young Ponder, PhD, director of community engagement and racial justice at the UCSF Benioff Homelessness and Housing Initiative, said, "The researchers had missed an entire world of economic insecurity, and the survey was much richer because the board members could see things the researchers could not."

The perception of people experiencing homelessness is often based on anecdote. On this episode of UCLA Housing Voice podcast, Margot Kushel, MD, director of the UCSF Benioff Homelessness and Housing Initiative, joins host Shane Phillips to talk about the California Statewide Study of People Experiencing Homelessness, and what it says about who experiences homelessness, why they become homeless, their experiences while living without housing, and barriers to re-entering stable housing. As the conversation moved to mental health, substance use disorder, and people experiencing homelessness, Dr. Kushel said, "People in those in depth interviews, talk to us really clearly, that while they might have been using these drugs before they became homeless, they're using them while homeless was a coping strategy."

Half of people experiencing homelessness are older than 50, and almost half of older homeless adults became homeless for the first time after they turned 50. This webinar is about the causes and consequences of homelessness in late life. Margot Kushel, MD, and other BHHI presenters will discuss findings from the Health Outcomes of People Experiencing Homelessness in Older Middle Age (HOPE HOME) project—a longitudinal cohort study following older adults experiencing homelessness in Oakland, CA, and the California Statewide Study of People Experiencing Homelessness (CASPEH)—the largest representative study of homelessness in the United States since the mid-1990s.

People experiencing homelessness are at an increased danger of dying. A recent study by the National Bureau of Economic Research showed a 40-year-old person experiencing homelessness has a similar risk of death as a 60-year-old person with housing. Previous studies have also found that people who experience homelessness have a greater mortality risk. Margot Kushel, MD, director of the UCSF Benioff Homelessness and Housing Initiative, said, "We’re letting people die because we’re not fixing the underlying crisis."

This paper describes the qualitative component of a large mixed method study, the California Statewide Study of People Experiencing Homelessness. The qualitative study consisted of seven sub-studies across eight counties, each exploring different dimensions of homelessness. BHHI researchers recruited participants from the overall sample, a statewide representative sample of adults experiencing homelessness recruited in eight counties, based on their responses to questions from the survey interviews. The researchers' mereological study design presents an approach for developing complex qualitative policy studies across a range of topic areas.

Nearly one-third of all Americans experiencing homelessness live in California. Starting in the fall of 2021, Aaron Shrank and Sam Comen conducted interviews and photographed unhoused people living in Los Angeles and Northern California as a companion piece to the University of California San Francisco Benioff Homelessness and Housing Initiative’s California Statewide Study of People Experiencing Homelessness to shed light on those affected. You can read a lightly condensed version of their stories. More of Comen and Shrank’s work is available at the website Unhoused CA.

The Benioff Homelessness and Housing Initiative at the University of California San Francisco, released a groundbreaking report on the characteristics and causes of homelessness in California. The study used a mixed methods approach, collecting data from more than 3,000 surveys and 365 in-depth interviews. In addition to reinforcing the existing—and alarming—trends around both an aging population and disproportionate representation of communities of color among those experiencing homelessness, there were several findings from the report that stand out.

The California Statewide Study on People Experiencing Homelessness researchers included people who were formerly or are currently experiencing homelessness. In this op-ed, Claudine Sipili, one of the Lived Expertise Advisory Board co-chairs, writes about the landmark study and her experience participating with the project. She writes, "Throughout the study, the board members’ guidance helped create a safe and dignified space for survey participants to share their experiences openly. By involving individuals with lived experience, we gained deeper insights into the complexities of homelessness."

California is home to 30% of the nation's homeless population, and 50% of the nation's unsheltered population. The UCSF Benioff Homelessness and Housing Initiative released the largest representative study on homelessness in decades. The study's findings dispel common myths and take a systematic approach to understanding the causes of homelessness and potential solutions. Inside the Issues host Alex Cohen speaks with Margot Kushel, MD, director of UCSF’s Benioff Homelessness and Housing Initiative, about the landmark study and the root causes of homelessness. When talking about older people experiencing homelessness, Dr. Kushel said, "The story of homelessness in California is really older adults, usually older adults of color, living their last years on our streets."

The California Statewide Study on People Experiencing Homelessness is the largest representative study on homelessness since the 1990s. The research highlighted crucial aspects of homelessness and debunked several myths. Margot Kushel, MD, director of the UCSF Benioff Homelessness and Housing Initiative and principal investigator of the landmark study emphasized the urgent need for a national effort to combat homelessness, building upon the insights gained from the California study.

On this podcast episode of Think Out Loud, Dave Miller speaks with Margot Kushel, MD, director of the UCSF Benioff Homelessness and Housing Initiative, about the new study on homelessness and how the findings could be relevant to Oregon. When talking about how the study's findings could provide insight to Oregon, Dr. Kushel said, "I'm afraid what we're seeing in California is definitely a model, in not a good way, up and down the west coast, and throughout other parts of the country."

Everyday 171,000 people experience homelessness in California; in rural areas, in urban areas, throughout California. Margot Kushel, MD, director of UCSF’s Benioff Homelessness and Housing Initiative and lead investigator spoke with the host of the California Sun podcast, Jeff Schechtman, about the recent study released by the UCSF Benioff Homelessness and Housing Initiative. When speaking about root causes, Dr. Kushel said, "The root cause comes back to just housing. It is right there in the name, to be homeless is to not have a home". 

Researchers at UCSF Benioff Homelessness and Housing Initiative have released the largest representative survey of homeless people in more than 25 years. Researchers surveyed over 3200 people experiencing homelessness in California, and conducted over 300 in-depth interviews. The California Statewide Study on People Experiencing Homelessness paints a different picture, debunking common myths and providing evidence-based solutions.

California has 12% of the US's population, but makes up roughly half of the nation's unsheltered homeless population. In late June, the UCSF Benioff Homelessness and Housing Initiative released a landmark report on the state of homelessness in California. In this episode of the Ezra Klein Show, Ezra speaks with the Atlantic writer, Jerusalam Desmas, about the reports core findings, what we know about homelessness, and what solutions exist to address it.

A landmark study by UCSF Benioff Homelessness and Housing Initiative (BHHI) paints a different picture on people experiencing homelessness in California. Researchers at BHHI sought to capture the experiences of all people aged 18 years and older who experience some form of homelessness in California. "It took a lot of time and was a lot of work, but we wanted to be able to show policymakers what this issue looks like instead of just giving them more numbers to look at," said Margot Kushel, MD, the study’s principal investigator and director of UCSF’s Benioff Homelessness and Housing Initiative.

California harbors 30% of the United State's homeless population, despite being home to 12% of the nation's population. A new study released by UCSF Benioff Homelessness and Housing Initiative tries to provide a comprehensive picture of how people become homeless and offers policy recommendations to build better programs to address the crisis in California and nationwide. Margot Kushel, MD, BHHI director and lead investigator speaks with Ali Martin about the study's findings. "Absolutely, we need more services, but you can’t ask the health care system to solve a housing problem." said Dr. Kushel.

It’s a common belief about homeless people in California: they move here from other places because of the state’s tolerance, mild weather, and generous services. But according to a recent UCSF study, at least 90% of those experiencing homelessness lived in California before losing their housing and 75% are in the same county they used to live in. In the largest study of its kind in nearly three decades, researchers talked to thousands of participants about their experiences to find out what factors pushed them over the edge into homelessness. The real story, researchers found, has more to do with the state’s poverty, inequality, and high housing costs. Talking about the study findings, UCSF BHHI Director and study author Margot Kushel, MD, and BHHI LEAB representatives, Jesica Giannola and Robynne Rose-Haymer, were guests on KQED Forum's ongoing series about homelessness in the Bay Area.

California is home to 12% of the United State's population, but is home to nearly one-third of the nation’s people experiencing homelessness. A landmark study by the UCSF Benioff Homelessness and Housing Initiative took an intimate look at the root causes of homelessness. The research team included people who were formerly or are currently unhoused residents in California. In this podcast episode of What Next, host Mary Harris speaks with Claudine Sipili a co-chair of the Lived Expertise Advisory Board. "And the older I get, the more I get to a place where I’m seeking understanding, like this point of intersection where I’m connecting with another human and helping them see what I see" said Claudine.

California invested $17.5 billion over four years to combat homelessness. However, despite the investment, there has been an increase in the number of people experiencing homelessness across the state. A recent report by the UCF Benioff Homelessness and Housing Initiative dispelled common myths about homelessness. Margot Kushel, MD, director of UCSF’s Benioff Homelessness and Housing Initiative and lead investigator said, "Nine out of 10 people lost their stable housing here. These are Californians. We have to create the housing for all Californians"

30 percent of homeless population lives in California. A comprehensive new study finds half of all unhoused adults in California are older than 50 years of age, and that people of color are disproportionately affected. Ali Rogin spoke with Margot Kushel, MD, director of UCSF’s Benioff Homelessness and Housing Initiative and lead investigator about the new landmark study. "This is really, I think, the story of homelessness in the last few decades, the proportion of people over 50 has skyrocketed" said Dr. Kushel.

Understanding the experiences of people experiencing homelessness is logistically difficult. The UCSF Benioff Homelessness and Housing Initiative conducted an ambitious study, where researchers sought to reflect the experiences of all people aged 18 and older experiencing homelessness in California. The study's findings provide evidence that the lack of housing services is a meaningful barrier to health care and income benefits. "I was really surprised by how little people thought it would have taken to prevent their homelessness. Do we know if people are overly optimistic? Sure, they might be. But I sort of believe people are experts in their own lives and people really felt that, had they interrupted that cycle, they could have hung on, but once they became homeless everything else fell apart." said Margot Kushel, MD, the the study's principal investigator and director of UCSF’s Benioff Homelessness and Housing Initiative.

Many people talk about California’s homeless community as a monolith, yet the state has distinct homeless populations. The makeup of California's homeless population is more varied than the public assumes. A new statewide study released by UCSF Benioff Homelessness and Housing Initiative helps provides more clarity to the causes and consequences of homelessness in California, debunks common myths, and recommends policy changes to shape programs in response.

For the California Statewide Study on People Experiencing Homelessness, the largest study on homelessness in California since 1996, the research team included people who were formerly or are currently unhoused residents in California. The Lived Expertise Advisory Board members at the UCSF Benioff Homelessness and Housing Initiative provided input on survey questions and planned outreach to people experiencing homelessness. Robynne Rose-Haymer, Lived Expertise Advisory Board representative, said, "We did extensive training with our interview team, not just in being trauma-informed, but in being empathetic listeners and approaching everyone with dignity."

In the largest representative study of homelessness in California since the mid-1990s, the California Statewide Study of People Experiencing Homelessness provides policy recommendations and demystifies common misconceptions. On Inside with Vicki Gonzalez, Margot Kushel, MD, director of UCSF’s Benioff Homelessness and Housing Initiative and lead investigator spoke with the host about the study's findings. "90% of people lost their last stable housing in California. Of the 10% who did not lose their housing in California, 30% of them were born in California" said Dr. Kushel.

The California Statewide Study of People Experiencing Homelessness “paints a representative picture” of homelessness and suggests policies backed by evidence, said Dr. Tiana Moore, the Policy Director at the UCSF Benioff Homelessness and Housing Initiative. “There's a lot of noise in California around who's experiencing homelessness and why,” Dr. Moore said, adding that the study pushes back against narratives that are dominating conversations right now. The study found that nine out of ten participants lost their last housing in the state. It is the largest study of its kind since the mid-1990s and the first large-scale study to use surveys as well as in-depth interviews, allowing researchers to “amplify the voices of those who are experiencing homelessness directly,” Dr. Moore said.

A comprehensive new study finds the vast majority of the California's unhoused residents lived in the state before losing their housing. The goal of the report was to take a systematic approach to understanding the causes of homelessness and potential solutions instead of relying on the emotional responses the crisis can trigger, said study author Margot Kushel, MD, director of the UCSF Benioff Homelessness and Housing Initiative. “What we were trying to do is take the rhetoric down a bit, and using really scientific best practices, to get a handle on not only who was experiencing homelessness but what was happening in their lives before they became homeless,” Dr. Kushel said.

Homeless people in California are already a vulnerable group, often struggling with poor health, trauma and deep poverty before they lose their housing. Lead investigator of the new study, Margot Kushel, MD, director of the UCSF Benioff Homelessness and Housing Initiative, spoke with KTLA's the reports findings. Dr. Kushel said, "the main drivers of homelessness are deep poverty."

California is home to 12% of the United State's population, but makes up to half of all the country's unsheltered population. In this podcast episode of Fifth & Mission, host Cecilia Lei speaks with Margot Kushel, MD, director of UCSF’s Benioff Homelessness and Housing Initiative and lead investigator, about California's largest examination of homeless adults since 1996. "This is a story of deep poverty in a state with incredibly high housing costs." said Dr. Kushel.

Researchers at UCSF just released the findings of a statewide study that’s the most comprehensive look at homelessness in nearly three decades. NBC Bay Area’s Raj Mathai spoke to Margot Kushel, MD, the study’s principal investigator and director of the UCSF Benioff Homelessness and Housing Initiative, for some insight. "People experiencing homelessness in California are Californians," said Dr. Kushel. "People just couldn't keep up with the incredibly high cost of housing. We need to up our game in prevention to keep people from losing their housing in the first place."

A large new study, conducted by the UCSF Benioff Homelessness and Housing Initiative asked people experiencing homelessness from all over California about what would have helped them avoid losing their housing. Margot Kushel, MD, the study’s principal investigator and director of UCSF BHHI, spoke with TIME about the studies key findings and recommendations. “You can’t build a homelessness prevention program only around eviction prevention. Those programs are important, but you’re going to miss a big chunk of people.” said Dr. Kushel.

People experiencing homelessness in California are already a vulnerable group, often struggling with poor health, trauma, and deep poverty before losing their housing. Margot Kushel, MD, the the study's principal investigator and director of UCSF’s Benioff Homelessness and Housing Initiative spoke with KTVU news about the key findings and recommendations. Dr. Kushel said, "These are not folks coming into California once they are homeless. They are our neighbors, our friends, our community members."

There is a massive shortage of affordable housing for people with very low incomes in California. Only 24 units of housing are affordable for every 100 extremely low income households in California, compared to 33 units nationally. To address the housing crisis, the statewide study on people experiencing homelessness recommend a variety of policies to increase affordable housing and provide more effort to prevent people from becoming homeless. "This is all about the disconnection between people’s incomes and housing costs" said Margot Kushel, MD, a physician who treats homeless people, and the lead investigator of the study for the UCSF Benioff Homelessness and Housing Initiative.

Loss of income is considered the number one factor for why Californians experience homelessness, according to new research from UCSF. The new findings highlight the idea that money is not only the main cause of the homelessness, but also a potential solution. "I think it’s really important to note how desperately poor people are, and how much it is their poverty and the high housing costs that are leading to this crisis" said Margot Kushel, MD, director of the UCSF Benioff Homelessness and Housing Initiative and principal investigator of the landmark study.

California’s homelessness crisis is a homegrown problem that is deepening amid a shortage of affordable housing and emergency shelter, and it’s often the brutal conditions of living on the street that trigger behavioral health problems, such as depression and anxiety, researchers found in a comprehensive study on homelessness. The new findings show that at least 90% of adults who are experiencing homelessness in the state became homeless while living in California. “This idea that homeless people are rushing into California is just not true,” said Margot Kushel, a physician who treats homeless people, and the lead investigator of the study for the UCSF Benioff Homelessness and Housing Initiative. “There’s so much myth-making around this magnet theory that people who are homeless flock to California, but this is our own problem.”

With modern home prices out of reach for many California residents on fixed incomes, older adults have become the fastest-growing segment of the unhoused population across the state, according to new research from UCSF. California makes up 30% of the nation’s unhoused population and is home to half of all the country’s unsheltered population, according to the landmark study, which looks at how people in the Golden State become unhoused, experience homelessness, and exit homelessness. Nearly half of all unhoused adults in the study were age 50 or older, and Black and Native American residents were “dramatically overrepresented,” the study shows. “The results of the study confirm that far too many Californians experience homelessness because they cannot afford housing,” said Margot Kushel, MD, director of the UCSF Benioff Homelessness and Housing Initiative and principal investigator of the landmark study.

Public policy and common perception have long tied the road to homelessness with mental illness and drug addiction. But a new study—the largest and most comprehensive investigation of California’s homeless population in decades—found another cause is propelling much of the crisis on our streets: the precarious poverty of the working poor, especially Black and brown seniors. “These are old people losing housing,” said Margot Kushel, MD, the lead investigator on the study, done at the request of state health officials.

There are a lot of myths about people who are homeless in California: They’re from another state. They don’t want a job. They don’t want a home. A new study published by the University of California, San Francisco, paints a different picture, one of people who were working and living in poverty in the state until they suddenly lost their homes. Not knowing where to turn, they ended up on the street, where they endure violence and poor health as they try for years to climb back to stability. “Something goes wrong, and then everything else falls apart,” said the study’s lead researcher, Margot Kushel, MD, director of the UCSF Benioff Homelessness and Housing Initiative. “Everything in their life gets worse when they lose their housing: their health, their mental health, their substance use.”

Homeless people in California are already a vulnerable group, often struggling with poor health, trauma and deep poverty before they lose their housing, according to a new study on adult homelessness. The study attempts to capture a comprehensive picture of how people become homeless in California, and what impeded their efforts at finding permanent housing. Researchers at the UCSF Benioff Homelessness and Housing Initiative hope that the study will strengthen public support for policies that focus on offering housing and emergency rental assistance—rather than policies emphasizing punishment or stigma. “People are homeless because their rent is too high. And their options are too few. And they have no cushion,” said Margot Kushel, MD, BHHI director and lead investigator. “And it really makes you wonder how different things would look if we could solve that underlying problem.”

California’s homeless population is predominantly made up of people who lived in the state before losing their housing, with nearly half older than 50 and a disproportionate number who are Black and indigenous, according to a new statewide study. “We have got to bring housing costs down, and we’ve got to bring incomes up,” said Margot Kushel, MD, the study’s principal investigator and director of UCSF’s Benioff Homelessness and Housing Initiative. “We need to solve the fundamental problem—the rent is just too high.”

Conducted by the UCSF Benioff Homelessness and Housing Initiative, the California Statewide Study of People Experiencing Homelessness (CASPEH) is the largest representative study of homelessness in the United States since the mid-1990s. The study provides a comprehensive look at the causes and consequences of homelessness in California and recommends policy changes to shape programs in response.

The University of California, San Francisco Benioff Homelessness and Housing Initiative (BHHI) has released the largest representative study of homelessness in the United States since the mid-1990s, providing a comprehensive look at the causes and consequences of homelessness in California and recommending policy changes to shape programs in response. The California Statewide Study of People Experiencing Homelessness (CASPEH) used surveys and in-depth interviews to develop a clear portrait of homelessness in California, where 30% of the nation’s homeless population and half of the unsheltered population live.