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However, it could be seen that these selectivity effects diminished in size after the interval between waves was reduced from 2008 on.To allow adjustments to be made for differential non-response in the successive panel waves, longitudinal weights are available.The primary goal of the project is to provide a representative national database containing information describing the living conditions of the country’s middle-aged and older population and to study diversity within the older section of the population, the process of ageing as it affects individuals and processes of social change as they relate to old age and ageing.For this purpose, a cohort-sequential design has been set up combining large cross-sectional samples with longitudinal samples.
To enhance the quality of the longitudinal sample, people willing to participate in the panel are generally allowed to miss out on one or more panel waves without being excluded from the address pool.Despite this, however, response rates for baseline samples decreased from 50.3% to 27.1% between 19 (see Table 1).Sample selectivity can be observed, as participation rates tend to be lower in large cities, among women and in both the middle-aged (40 to 54 years) and oldest age groups (70 to 85 years).by sending greeting cards and booklets along with study results).As a consequence, the retention rate - defined as valid re-interviews as a proportion of the number of valid interviews in the baseline year - has increased (see Table 2).
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The DEAS baseline samples are nationally representative for adults aged from 40 to 85 years.