What is the American Trends Panel (ATP)? The American Trends Panel is Pew Research Center’s primary source of survey data for U.S. public opinion research. It is a multimode, probability-based survey ...

Longitudinal data is a collection of repeated observations of the same subjects, taken from a larger population, over some time.

The methods are described, and their performances are compared both with a simulation and a substantive example using the National Survey of Families and House-holds two-wave panel. The results ...