To calculate the residual mean square, we use n-3 instead of n-1 as we would for a usual variance.

Question

Quizplus · Accepted Answer

The residual mean square is typically calculated using n-p, where n is the number of observations and p is the number of parameters estimated in the model (including the intercept), not n-3 specifically. For a simple linear regression, p would be 2 (one for the slope and one for the intercept), so it would be n-2, not n-3.

To Calculate the Residual Mean Square, We Use N-3 Instead