search for: insulbefore

...ce Table Model 1: Temp ~ Gas + Insul Model 2: Temp ~ Insul/Gas - 1 Res.Df RSS Df Sum of Sq F Pr(>F) 1 53 52.045 2 52 48.704 1 3.341 3.5673 0.06451 . It seems like this approach would yield insight into whether or not the two slope terms (InsulBefore:Gas and InsulAfter:Gas) were different. However, is there a formal test for this sort of question, and can it be generalized to differences between more than 2 slope terms? Thanks, Dylan -- Dylan Beaudette Soil Resource Laboratory http://casoilresource.lawr.ucdavis.edu/ University of Califo...

Dear List-members, Hopefully someone will help through my confusion: In order to get the same coefficients as we get from the following ## require (MASS) summary ( lm(Gas ~ Insul/Temp - 1, data = whiteside) ) ...................... we need to do the following (if we use model.matrix to specify the model) ## summary ( lm(Gas ~ model.matrix(~ Insul/Temp - 1) - 1, data = whiteside) )