Population change and its components in Pennsylvania, 1980-1990.

The author analyzes patterns of population growth in Pennsylvania by county. "Although Pennsylvania's population increased only slightly from 1980-1990, the pattern of change portrays noteworthy growth in many counties in the eastern half of the Commonwealth and decline throughout much of the west.... Analysis of the components of change--fertility, mortality, and net-migration--reveals significant differences in the role played by reproductive change in the demographic equation among counties which grew in population and, to a lesser extent, among those which declined. Changes in numbers of inhabitants and their components are related to location and selected demographic, social, and economic characteristics of the county populations."