Validation of data quality from Polish Fertility Survey 2002 with use of cohort fertility rates
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Abstract
The paper validates data from the Fertility Survey 2002 in order to establish their comparability with selected variables from the National Census and cohort fertility trends calculated with use of the birth register database. In the fi rst part of the analysis, we compare distributions of residence, age and educational level from the Fertility Survey and the National Census in order to measure the sampling bias. The second part of the analysis compares cohort fertility rates based on the Fertility Survey and registration of births. In this part, both weighted and nonweighted Fertility Survey data were used in order to account for biases from the cohort fertility based on registration data. We conclude that the distribution of selected variables obtained from the Fertility Survey sample signifi cantly deviates from the respective distribution from the National Census. This bias infl uences cohort fertility rates calculated using Fertility Survey data, which tend to overestimate cohort fertility rates observed in the population. Application of inverse probability weights removes the bias in the sample structure but does not entirely remove overestimation of cohort fertility rates. We also conclude that the remaining difference in cohort fertility results from other sources of bias which we cannot control for. However, the magnitude of bias should not have an impact on the results of statistical modeling with use of Fertility Survey data.
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