Longitudinal and Panel Data Analysis in R Goal: A CRAN task view for panel/longitudinal data analysis in R.
What is Panel Data? Panel data are variously called longitudinal, panel, cross-sectional time series, and pooled time series data. The most precise definition is two-dimensional data; invariably one of the dimensions is time. We can think about a general depiction of what a model with linear coefficients typical for such data structures, though ridiculously overparameterized, like so: