AbstractBACKGROUNDA key feature of the Generations & Gender Programme (GGP) is that longitudinal micro-data from the Generations and Gender Surveys (GGS) can be combined with indicators from the Contextual Database (CDB) that provide information on the macro-level context in which people live. This allows researchers to consider the impact of socio-cultural, economic, and policy contexts on changing demographic behaviour since the 1970s. The validity of longitudinal analyses combining individual-level and contextual data depends, however, on whether the micro-data give a correct account of demographic trends after 1970.OBJECTIVEThis article provides information on the quality of retrospective longitudinal data on first marriage and fertility in the first wave of the GGS.METHODSUsing the union and fertility histories recorded in the GGS, we compare period indicators of women's nuptiality and fertility behaviour for the period 1970-2005 and cohort indicators of nuptiality and fertility for women born after 1925 to population statistics.RESULTSResults suggest that, in general, period indicators estimated retrospectively from the GGS are fairly accurate from the 1970s onwards, allowing exceptions for specific indicators in specific countries. Cohort indicators, however, were found to be less accurate for cohorts born before 1945, suggesting caution when using the GGS to study patterns of union and family formation in these older cohorts.CONCLUSIONSThe assessment of the validity of demographic data in the GGS provides country-specific information on time periods and birth cohorts for which GGS estimates deviate from population statistics. Researchers may use this information to decide on the observation period or cohorts to include in their analysis, or use the results as a starting point for a more detailed analysis of item nonresponse in union and fertility histories, which may further improve the quality of GGS estimates, particularly for these earlier periods and older birth cohorts.COMMENTSDetailed country-specific results are included in an appendix to this paper, available for download from the additional material section.(ProQuest: ... denotes formulae omitted.)1. IntroductionIn 2000 the Population Activity Unit (PAU) of the United Nations Economic Commission for Europe (UNECE) launched the Generations and Gender Programme (GGP) to enhance understanding of the causes and consequences of demographic change in developed countries (Vikat et al. 2007). International comparability is a key feature of the GGP and several, mainly European, countries have become highly committed to the implementation of the programme. The GGP consists of two pillars. The first pillar is a set of Generations and Gender Surveys (GGS)5. The GGS is a panel survey that collects longitudinal micro-level data on a representative sample of noninstitutionalized residents aged 18 to 79 years in each of the participating countries. The first wave of the GGS collects detailed data on partnership histories and (non-)resident children, making it possible to reconstruct changes in union formation and fertility in recent decades and link these to covariates at the individual, household, and contextual levels. To overcome the limitations associated with the retrospective design of the Fertility and Family Surveys (FFS) - the immediate predecessor of the GGP - the GGS combines elements of a retrospective setup with a prospective panel design (Vikat et al. 2007). The prospective design makes it possible to assess the impact of characteristics recorded in each wave (e.g., values and intentions) on subsequent behaviours, thus contributing to an enhanced understanding of the dynamic nature of demographic behaviour and the life-course. The Contextual Database (CDB)6 (see the contribution of Caporali et al. in this special volume) is the second main pillar of the GGP and provides aggregate indicators at the meso (regional) and macro (national) levels. …
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