Contingency table structure for two binary attributes (j and l) measured across 1 ≤ i ≤ n observations.

Contingency table structure for two binary attributes (j and l) measured across 1 ≤ i ≤ n observations.用于描述1 ≤ i ≤ n个观测样本中测得的两个二元属性j与l的列联表（Contingency table）结构。