The number of degrees of freedom for a contingency table with r rows and c columns is:
A)r + c
B)rc
C)(r − 1)(c − 1)
D)None of these choices.

Question

Quizplus · Accepted Answer

The formula for degrees of freedom for a contingency table is (r-1)(c-1). This formula takes into account the fact that the last row and last column can be determined from the previous rows and columns, thus reducing the number of independent entries in the table. Therefore, the correct answer is (r-1)(c-1).

The Number of Degrees of Freedom for a Contingency Table