We consider the estimation of the size of a closed population, often of interest for wild animal populations, using a capture-recapture study. The estimate of the total population size can be very ...

The assumption of equal catchability of marked and unmarked animals in mark-recapture sampling is examined. Violation of this assumption may come from two basic sources, heterogeneity or contagion, ...

To estimate the population of undocumented immigrants in different parts of Chicago, demographer Rob Paral and Associates used Department of Homeland Security and census data. The map below shows ...