Degrees of freedom chi squared test
Find the degrees of freedom for a particular chi squared test below:
| Test | Degrees of freedom |
| Goodness of fit test | $I - 1$. Here $I$ is the number of groups. |
| Chi squared test for the relationship between two categorical variables | $(I - 1) \times (J - 1)$. Here $I$ is the number of groups for the first variable and $J$ is the number of groups for the second variable. |
| Kruskal-Wallis test | $I - 1$. Here $I$ is the number of groups for the independent variable. |
| McNemar's test | 1. |
| Cochran's Q test | $k - 1$. Here $k$ is the number of related groups. |
| Friedman test | $k - 1$. Here $k$ is the number of related groups. |
| Stuart-Maxwell test | $J - 1$. Here $J$ is the number of groups for the dependent variable. |
| Model chi squared test for the complete logistic regression model | $K$. Here $K$ is the number of independent variables in the model. |
| Chi squared test for a single logistic regression coefficient | 1. |