The order of subtraction for the test in the notes is determined by which model has more degrees of freedom. In the Core Reading, model 1 is the one with more degrees of freedom. We don’t need to label one model the “initial model” and one the “revised model”. In terms of getting the order right, what matters is which has more degrees of freedom. If this comes up, follow the guidance in my previous post.
I hope this is helpful.
Last edited: Jul 11, 2010