2x2Tafel
2x2Tafel, usually called a 2x2 contingency table, is a two-by-two matrix used in statistics to summarize the relationship between two binary variables. It contains four cells with counts a, b, c, and d. Typically, one variable is arranged along the rows (e.g., disease: present vs absent) and the other along the columns (e.g., test result: positive vs negative).
From these counts, researchers derive measures of association and accuracy. Sensitivity a/(a+c) and specificity d/(b+d) describe
Statistical tests commonly used with a 2x2 table include the chi-squared test for independence, Fisher's exact
Applications include epidemiology and clinical research for evaluating diagnostic tests, treatment effects in cohort studies, and
The term 2x2-Tafel is used in German-language literature to denote such a table; in English-language contexts