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The California Families Project (CFP) is an ongoing longitudinal study of Mexican origin families in Northern California. This study uses community, school, family, and individual characteristics to examine developmental pathways that increase risk for and resilience to drug use in Mexican-origin youth. This study also examines the impact that economic disadvantage and cultural traditions have in Mexican-origin youth. The CFP includes a community-based sample of 674 families and children of Mexican origin living in Northern California, and includes annual assessments of parents and children. Participants with Mexican surnames were drawn at random from school rosters of students during the 2006-2007 and 2007-2008 school year. Data collection included multi-method assessments of a broad range of psychological, familial, scholastic, cultural, and neighborhood factors. Initiation of the research at age 10 was designed to assess the focal children before the onset of Alcohol, Tobacco, and Other Drug (ATOD) use, thus enabling the evaluation of how hypothesized risk and resilience mechanisms operate to exacerbate early onset during adolescence or help prevent its occurrence. This study includes a diversity of families that represent a wide range of incomes, education, family history, and family structures, including two-parent and single-parent families.

The accompanying data file consists of 674 family cases with each case representing a focal child and at least one parent (Two-parent: n=549, 82 percent; Single-parent: n=125, 18 percent). Of the 3,139 total variables, 839 pertain to the focal child, 1,376 correspond to the mother, and 908 items pertain to the father.

Please note: While the California Families Project is a longitudinal study, only the baseline data are currently available in this data collection.

The Future of Families and Child Wellbeing Study (FFCWS, formerly known as the Fragile Families and Child Wellbeing Study) follows a cohort of nearly 5,000 children born in large, U.S. cities between 1998 and 2000. The study oversampled births to unmarried couples; and, when weighted, the data are representative of births in large U.S. cities at the turn of the century. The FFCWS was originally designed to address four questions of great interest to researchers and policy makers:

1. What are the conditions and capabilities of unmarried parents, especially fathers?
2. What is the nature of the relationships between unmarried parents?
3. How do children born into these families fare?
4. How do policies and environmental conditions affect families and children?

The FFCWS consists of interviews with mothers, fathers, and/or primary caregivers at birth and again when children are ages 1, 3, 5, 9, 15, and 22. The parent interviews collected information on attitudes, relationships, parenting behavior, demographic characteristics, health (mental and physical), economic and employment status, neighborhood characteristics, and program participation. Beginning at age 9, children were interviewed directly (either during the home visit or on the telephone). The direct child interviews collected data on family relationships, home routines, schools, peers, and physical and mental health, as well as health behaviors.

A collaborative study of the FFCWS, the In-Home Longitudinal Study of Pre-School Aged Children (In-Home Study) collected data from a subset of the FFCWS Core respondents at the Year 3 and 5 follow-ups to ask how parental resources in the form of parental presence or absence, time, and money influence children under the age of 5. The In-Home Study collected information on a variety of domains of the child's environment, including: the physical environment (quality of housing, nutrition and food security, health care, adequacy of clothing and supervision) and parenting (parental discipline, parental attachment, and cognitive stimulation). In addition, the In-Home Study also collected information on several important child outcomes, including anthropometrics, child behaviors, and cognitive ability. This information was collected through interviews with the child's primary caregiver, and direct observation of the child's home environment and the child's interactions with his or her caregiver.

Similar activities were conducted during the Year 9 follow-up. At the Year 15 follow-up, a condensed set of home visit activities were conducted with a subsample of approximately 1,000 teens. Teens who participated in the In-Home Study were also invited to participate in a Sleep Study and were asked to wear an accelerometer on their non-dominant wrist for seven consecutive days to track their sleep (Sleep Actigraphy Data) and that day's behaviors and mood (Daily Sleep Actigraphy and Diary Survey Data).

An additional collaborative study collected data from the child care provider (Year 3) and teacher (Years 9 and 15) through mail-based surveys. Saliva samples were collected at Year 9 and 15 (Biomarker file and Polygenic Scores). The Study of Adolescent Neural Development (SAND) COVID Study began data collection in May 2020 following the onset of the COVID-19 pandemic. It included online surveys with the young adult and their primary caregiver.

The FFCWS began its seventh wave of data collection in October 2020, around the focal child's 22nd birthday. Data collection and interviews continued through January 2024. The Year 22 wave included a young adult (YA) survey with the original focal child and a primary caregiver (PCG) survey. Data were also collected on the children of the original focal child (referred to as Generation 3, or G3).

In 2017, the FFCWS team announced the Fragile Families (FF) Challenge, a collaborative effort in which participants were tasked with using machine learning methods and FFCWS data (Baseline to Year 9) to build a model that would predict six key outcomes at Year 15. Materials used in the FF Challenge have been archived in this collection.

Documentation for these files is available on the FFCWS website under Data and Documentation. For details of updates made to the FFCWS data files, please see the project's Data Alerts page.

Data collection for the Future of Families and Child Wellbeing Study was supported by the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) of the National Institutes of Health under award numbers R01HD36916, R01HD39135, and R01HD40421, as well as a consortium of private foundations.

Below is the citation for use of the FFCWS data accessed through ICPSR. For information on additional citation requirements when using FFCWS in publications, please refer to this FAQ on the FFCWS project site.

The Kinder Houston Area Survey is a longitudinal study that began in May 1982 after Houston, Texas, recovered from the recession of the mid-1980s. The overall purpose of this research was to measure systematically the public responses to the new economic, educational, and environmental challenges, and to make the findings of this continuing project readily available to civic and business leaders, to the general public, and to research scholars. Part 1, All Responses from 25 Successive Samples, contains all the responses from the successive representative samples of Harris County residents from 1982 through 2014. These are the data that enabled the project to analyze continuity and change among area residents over the course of 26 years. In 13 of the 14 surveys (the years from 1994 through 2014, the one exception being 1996), the surveys were expanded with oversample interviews in Houston's ethnic communities. Using identical random-selection procedures, and terminating after the first few questions if the respondent was not of the ethnic background required, additional interviews were conducted in each of the years to enlarge and equalize the samples of Anglo, African American, and Hispanic respondents at about 500 each. In 1995 and 2002, the research also included large representative samples (N=500) from Houston's Asian communities, with one-fourth of the interviews conducted in Vietnamese, Cantonese, Mandarin, or Korean -- the only such surveys in the country. These additional interviews are included in Part 2, Additional Oversample Interviews.

The data contained in Part 2 are for Restricted-Use of Part 1, All Responses from 25 Successive Samples.

The data contained in Part 3 are based on a 14-year total of 6,576 Anglos, 6,086 African Americans, 6,094 Hispanics, and 1,250 Asians, along with 387 others, and are of particular value in assessing the similarities and differences both within and among Houston's (and America's) four largest ethnic groups. Beginning in 2003, the data files have incorporated detailed information from the 2000 Census on the characteristics of the respondent's neighborhood, not only at the level of home ZIP code, but also by Census tract and block group.

In Part 4, Restricted-Use information from 2000 Census, the data record the population and geographical area of each of the three sectors, distributions by ethnicity and immigrant status, age and gender composition, employment and commuting patterns, and levels of education and income. With this information incorporated in the datasets covering five years of expanded surveys, researchers are able to connect the respondents' perceptions and experiences with information on the neighborhoods in which they live, thereby adding a contextual dimension to analyses of the factors that account for individual differences in attitudes and beliefs. Conducted during February and March of each year, the interviews measured perspectives on the local and national economy, on poverty programs, inter-ethnic relationships. Also captured were respondents' beliefs about discrimination and affirmative action, education, crime, health care, taxation, and community service, as well as their assessments of downtown development, mobility and transit, land-use controls and environmental concerns, and their attitudes toward abortion, homosexuality, and other aspects of the social agenda. Also recorded were religious and political orientations, as well as an array of demographic and immigration characteristics, socioeconomic indicators, and family structures.

The National Survey of Families and Households (NSFH), Wave 1 (1987-1988) is the first of three waves in a longitudinal survey that was designed to study the causes and consequences of changes happening in families and households within the United States. At a time when the range of family structures was becoming more and more diverse, this study permitted a close examination of the resulting family compositions and household operations. One adult per household was randomly selected as the primary respondent, and there was a total of 13,007 respondents. In addition to the main interview conducted with the primary respondent, a shorter, self-administered questionnaire was given to the spouse or cohabitating partner, and also administered to the householder if he or she was a relative of the primary respondent.

A considerable amount of life-history information was collected, such as the respondent's family living arrangements in childhood, departures and returns to the parental home, and histories of marriage, separation, divorce, cohabitation, adoption, child custody arrangements, and stepfamily relations. Respondents were also asked about the relationship of household members to each other and the quality of their relationships with their parents, children, and in-laws. Information on economic well-being was also collected, including earnings from wages, self-employment income, interest, dividends, investments, pensions, Social Security, public assistance, and child support/alimony. Demographic information collected includes sex, age, marital status, education, and employment.

The National Survey of Families and Households (NSFH), Wave 2 1992-1994, a longitudinal population-based survey of families and households in the United States, investigates the causes and consequences of changes in American family and household structure. This is the second wave of a three part survey. The current study, NSFH Wave 2, is the second follow up and was conducted in 1992-1994. The sample included all NSFH Wave 1 main respondents and spouse/partner with focal children and all other NSFH Wave 1 main respondents ages 45 and over in 2000, as well as their NSFH Wave 1 spouse/partner.

The Wave 2 survey included the following components: (1) an interview of all surviving members of the original sample via face-to-face personal interview, (2) a personal interview with the current spouse or cohabiting partner almost identical to the interview with the main respondent, (3) a personal interview with the original spouse or partner of the primary respondent in cases where this relationship had ended, (4) a telephone interview with "focal children" who were originally aged 13-18 in Wave 1, (5) a short telephone interview with "focal children" who were originally aged 5-12 in Wave 1, (6) short proxy interviews with a surviving spouse or other relative in cases where the original respondent had died or was too ill to interview, and (7) a telephone interview with a randomly-selected parent of the main respondent. Demographic information collected includes sex, age, marital status, education, and employment