Concept

Contingency Table

A contingency table is used to summarize the relationship between several categorical variables. If individuals in a population can be classified by two attributes, AA and BB, where AA has rr levels A1,A2ArA_1, A_2 \dots A_r, and BB has cc levels B1,B2BcB_1, B_2 \dots B_c. Take a sample of size nn from the population. The number of individuals whose attributes belong to both rank AiA_i and BjB_j is denoted as nijn_{ij}, which is called the frequency.

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Updated 2026-06-20

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Data Science

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