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Understanding Society : the UK Household Longitudinal Study. Background. Understanding Society is a longitudinal study based on a household panel design Basic design similar to that of British Household Panel Survey, which it will replace.
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Background • Understanding Society is a longitudinal study based on a household panel design • Basic design similar to that of British Household Panel Survey, which it will replace. • Target sample size of 40,000 households – largest HPS • Main fieldwork due to start in January 2009
Developments so far • ESRC secured funding for Understanding Society from Large Science Facilities fund (normally for physical science infrastructure), Spring 2006 • November 2006 – March 2007, commissioning of principal investigator team • From April 2007, PI team starts work with consultation and commission survey organisation • September 2007, NatCen selected to deliver the survey. • January 2008, ‘Innovation panel’ survey of 1500 households starts
Household panel study design • Start with a sample of addresses, all members of private households found will be sample members. • At each wave all sample members above a threshold age eligible for interview. • Other individuals who form households with sample members after wave 1 eligible for interview. • A longitudinal sample of individuals representing the whole population, and interviewed within a household context. • Individuals followed as they move and form new households. • Following rules mean that the study remains representative of the population as it changes, subject to weighting and except for new immigrants to the UK.
Importance of the Household focus • Strength of the HPS model shown by range of studies internationally (e.g. PSID, SOEP, HILDA) • Important for research on e.g. • consumption and income, where within-household sharing of resources is important, • demographic change, where the household itself is often the object of study. • Can investigate family factors in decision making • Observing multiple generations allows examination of long-term transmission processes • Comparative analysis of sibling outcomes • Opportunities to explore linkages outside the household
Key features of Understanding Society • Large sample size proposed • Representative sample of whole population (all ages) • Multi-purpose multi-topic design to meet a wide range of disciplinary and inter-disciplinary research needs • Ethnic minority research • Research linking social and biomedical sciences • Innovation in data collection methods
Managing innovation in a longitudinal study • Timetable does not permit long lead-in to develop new method and new content • Starting in an appropriately conservative manner to ensure that the study is properly established • But ensure that there is scope for significant innovation as the study develops • Understanding Society is intended as study over several decades: new research issues and new research methods are unpredictable
Understanding Society sample consists of: • A new equal probability main panel achieved sample of around 27,000 households. The fieldwork for this sample will commence in January 2009 • A boost ethnic minority sample, focussed on five main ethnic minority groups, comprising 4,000 households • The BHPS sample of approximately 8,400 households. BHPS sample data collection as part of the Understanding Society will start with wave 2 in October 2009 • An Innovation Panel of 1500 households to enable methodological research. The fieldwork for the Innovation Panel will commence in January 2008.
Role of the Innovation Panel • 1,500 household panel, taking place one year ahead of main stage • Role is to allow experimentation and methodological development • For first 2 waves used to explore mixed mode strategy and impacts on attrition / question response • Later for new data collection methods and innovative content, e.g. web, diaries, biomarkers and health measurement, etc
Data collection plan • 12 month intervals between interviews • Continuous fieldwork over 24 month field period, with second wave overlapping with first • Face-to-face interview at wave 1; mixed mode at wave 2, 20%+ face to face only • Individual interview not more than 30 minutes interview administered, plus self completion and consents to link data • Some data collection by self completion from children aged 10-15 from wave 1
Wave 1 content • Annual repeating measures • Initial conditions and life history, asked once only • Rotating and intermittent measures first introduced at wave 1 • Young persons questionnaire for sample members aged 10-15
Long term content plans • Annual content – carried forward from wave 1 (< 50% of content) • New annual content – event histories over past year, follow-up questions from event or change of status, age specific modules • Relatively stable characteristics measured occasionally • Other intermittent modules repeated every 2/3 years • Scope for including emerging issues
BHPS and Understanding Society • At wave 2 of Understanding Society (wave 19 of BHPS), the BHPS sample will become part of Understanding Society • Expected that BHPS will use new questionnaire from that point (with very limited modification to preserve some measurement continuity) • Development process recognised importance of comparability with BHPS – so likely to be significant use of BHPS questions in Understanding Society • But, likely that a high proportion of BHPS questions will not be included, or will be asked less frequently
Opportunities • Starting again, compared with BHPS, an opportunity to review activities and see which are worthwhile to continue, which not • Focus on new research issues • Opportunities for mixed methods: • Data linkage – administrative, organisation, spatial • Bio-markers and health indicators • Qualitative data • Other non-standard data: diaries, visual, audio • Use of different modes • E.g. web to collect data with higher frequency • Experiment with new technology as it is introduced • Overall aim: to build a robust survey structure within which can experiment and innovate while minimising risk