OBJECTIVES To derive the best possible estimates of trends in age at first sex (AFS) among successive cohorts of Ugandan men and women based on all the data available from the Demographic and Health Surveys (DHS) and cohort studies in Masaka and Rakai districts. METHODS The datasets from the DHS, Masaka cohort and Rakai cohort were analysed separately. Survival analysis methods were used to e...

The latest and the most elaborate theory describing economic growth is the Unified Growth Theory (Galor, 2005, 2011). The theory, or model, describing the growth of human population is the Demographic Transition Theory (see for instance Caldwell, 1976, 2006; Casterline, 2003; Coale, 1973; Haupt & Kane, 2005; Kirk, 1996; Landry, 1934; Lee, 2003; Lehr, 2009; McFalls, 2007; Notestein, 1945; Olshan...

BACKGROUND Social media data is a promising source of social science data. However, deriving the demographic characteristics of users and dealing with the nonrandom, nonrepresentative populations from which they are drawn represent challenges for social scientists. OBJECTIVE Given the growing use of social media data in social science research, this paper asks two questions: 1) To what extent a...

Most population dynamics models explicitly track the density of a single sex. When the operational sex ratio can vary, two-sex models may be needed to understand and predict population trajectories. Various functions have been proposed to describe the relative contributions of females and males to recruitment, and these functions can differ qualitatively in the patterns that they generate. Whic...

Buchanan et al.’s (1) statistical evaluation of radiocarbon dates as a demographic proxy depends on accurate and complete datasets. However, their database is incomplete for the Southeast, where 181 radiocarbon dates from Paleoindian and Early Archaic deposits are now available (2). Only a fraction of these are included in their analysis. Within the more complete dataset only 4 of these determi...