Investigations of differences in this protective effect by gender, by age, and in contrast to different unmarried statuses, however, have yielded inconsistent conclusions. The variances about the parity-specific birth probabilities are halved when registration-system data are used to constrain the estimates. Our results suggest that the quality of male fertility data is strongly linked to survey design and that it has implications for models of early male fertility. These estimates encompass whites and blacks of the baby boom generation and the two preceding generations. May American Journal of Public Health. Comparing fertility rates in each survey with population rates based on data from Vital Statistics and the U. In , a major and devastating fire, which would later be known as the Great Fire of London, ravaged the city for days.
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Its estimates of male emigrants are double those of U. Sikora also has an interest in informal care-giving for the elderly. Elderly Poverty Alleviation through Living with Family. Hazard event-history techniques are used to estimate movements into and out of headship, accounting for duration dependence and left-censored spells. Bias in the reporting of obesity decreased with children's age and reversed direction at ages years. Objective A common problem when using panel data is that individuals' histories are incompletely known at the first wave.