Find the degrees of freedom for a particular F test below:

Test	Degrees of freedom numerator	Degrees of freedom denominator
One way ANOVA $F$ test	$I - 1$. Here $I$ is the number of groups.	$N - I$. Here $N$ is the total sample size and $I$ is the number of groups.
Two way ANOVA $F$ test	$F$ test for main and interaction effects together (model): $(I - 1) + (J - 1) + (I - 1) \times (J - 1)$ $F$ test for main effect A: $I - 1$ $F$ test for main effect B: $J - 1$ $F$ test for the interaction effect: $(I - 1) \times (J - 1)$ Here $I$ is the number of groups for independent variable A and $J$ is the number of groups for independent variable B.	$N - (I \times J)$. Here $N$ is the total sample size, $I$ is the number of groups for independent variable A, and $J$ is the number of groups for independent variable B.
$F$ test for complete regression model (OLS)	$K$. Here $K$ is the number of independent variables in the model.	$N - K - 1$. Here $N$ is the sample size and $K$ is the number of independent variables in the model.