The two-way chi-square is one of a number of tests of goodness of fit between actual values of two nominal or ordinal variables and the values that would be expected if the variables were unrelated to each other or independent. The chi-square is also called the Pearson chi-square and the chi-square test of independence. The symbol for the chi-square test is a lower case Greek letter chi (χ) with a 2 as superscript as follows: χ2. The χ2 is a significance test and should be accompanied by an appropriate strength test, which should be selected on the basis of the number of rows and columns in a table of observed values. Specifically, the most commonly used strength tests include the π coefficient (for 2 × ...
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