APCI: An R and Stata Package for Visualizing and Analyzing Age-Period-Cohort Data.

Social scientists have frequently attempted to assess the relative contribution of age, period, and cohort variables to the overall trend in an outcome. We develop an R package (and Stata command apci) to implement the age-period-cohort-interaction (APC-I) model for estimating and testing age, period, and cohort patterns in various types of outcomes for pooled cross-sectional data and multi-cohort panel data. Package also provides a set of functions for visualizing the data and modeling results. We demonstrate the usage of package with empirical data from the Current Population Survey. We show that package provides useful visualization and analytical tools for understanding age, period, and cohort trends in various types of outcomes.