Fundamentals of Statistics contains material of various lectures and courses of H. Lohninger on statistics, data analysis and chemometrics......click here for more. 
Home Bivariate Data Correlation Contingency Table  
Contingency TableIf we look at two nominal or ordinal variables having a limited number of categories, we may not only calculate the frequency tables for the individual variables but also a joint frequency table which contains the frequencies of all combinations of categories of both variables. Such a joint frequency table is called contingency table or cross tabulation.^{(1)} This table may either contain absolute or relative fequencies:
In addition to the frequencies of the combination of categories, so called marginal sums, or marginal frequencies,^{(2)} are displayed along with the contingency table. These marginal frequencies are equal to the frequencies of the corresponding categories. The total sum of all entries in the contingency table is either equal to the number of observations N for absolute frequencies, and is equal to 1.0 for relative frequencies.


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