Chi-square & Fisher’s Test
Chi-square test of independence and Fisher’s exact test in R — from a 2×2 table to a p-value, with the expected counts and when to use each.
Are two categorical variables associated? Test it with a contingency table.
Run the code
Everything in the video — edit it and press Run Code to run real R right here, or copy it:
Download this R script · ▶ Open the full playground
When to use it. Use chi-square for large samples; check the expected counts and switch to Fisher’s exact test when any expected count is small (below ~5).
Try the chi-square calculator · read chi-square in R.