Conditional Independence Test for Categorical Data Using Poisson Log-Linear Model

摘要

We demonstrate how to test for conditional independence of two variables withcategorical data using Poisson log-linear models. The size of the conditioningset of variables can vary from 0 (simple independence) up to many variables. Wealso provide a function in R for performing the test. Instead of calculatingall possible tables with for loop we perform the test using the log-linearmodels and thus speeding up the process. Time comparison simulation studies arepresented.