This module tests the hypothesis about independence of two categorical variables A, B based on experimentally observed occurence of combinations of particular levels of A, B. Number of levels of A is denoted r, number of levels of B is denoted c. The data are organized in the table of frequencies. Only the thick bordered box needs to be specified, the totals are calculated automatically.

Contingency Tables - Pdf manual

The the following table we have volumes of products of three types 1, 2 3 sold to 4 different markets, Europe, Asia, USA, and Africa. We want to test if there is a difference in structure between products or between markets. Practically, we test if the proportion between products is the same for any market and simultaneously if the proportion between markets is the same for any product.