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

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 ...

Using a state-level panel data set related to public health administration as an example, I compare four categories of panel model specifications: (1) the fixed effects model, (2) the random effects ...

Starting Sept. 1, viewership data will be based on Big Data+Panel, which has been in the works for years at Nielsen as the ...

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 ...