Population constraints on pooled surveys in demographic hazard modeling.

In non-experimental research, data on the same population process may be collected simultaneously by more than one instrument. For example, in the present application, two sample surveys and a population birth registration system all collect observations on first births by age and year, while the two surveys additionally collect information on women's education. To make maximum use of the three data sources, the survey data are pooled and the population data introduced as constraints in a logistic regression equation.

Marital disruptions and loss of support in later life: a longitudinal study of the United Kingdom.

Marital disruption (i.e. due to death, divorce or separation) at older ages is an important issue as it removes the usual primary source of help and support: a husband or wife.