How to calculate chi square degrees of freedom

Answer

The Degrees of freedom is the number of values that can vary in the sample data after estimating certain parameters . The number of degrees of freedom is always indicated by df

Calculating the degrees of freedom in chi-square test depends on the test .

-for chi square test of independence with a contingency table having c columns and r rows, df=(c-1)*(r-1)

-for chi-square goodness of fit with n categories, df=n-1

-for chi-square test for one population variance/standard deviation given a sample of size n, df=n-1

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