?1. Het = 3 (posted 12/5 @ 12:00) is impossible. Check your data.?
Thanks. ?Het? is 4 for R1 Aubqe:
a1 a3 b1 b47 c1 c2 C S C S c S c S C S C S "Het" Aubqe H L H H H L H L L L L H 4
?2. Why do you present results from the regressions of c on both(u,e,u*e) and (u,e,u*e,u^2) for the same data? It is unusual to consider the results of both analyses, except for the purpose of deciding which model to use. Have you checked the significance of the quadratic term? Does its inclusion reduce the Standard Error of Prediction (SEP) substantially? (Those are two conceptually separate issues.)?
I presented results from both out of ignorance, i.e. not knowing whether the similarity of ?het?, ?L-H?, and ?H-L? results for both regressions would be relevant to your consideration of the entire matter.
But re actual comparison of the two regressions, consider for the sake of discussion just the average slopes Aubu and Aubqu for c on (u,e,u*e) and c on (u,e,u*e,u^2) respectively.
For these two average slopes the ?2-way? data for Subset x MoSS | (Fold x Set x Length) = (a1,1,24) are:
t 0.297413484 0.274819583 df 133.708200500 128.3098338 2-tailed p 0.766614886 0.783897935 N for 1S 47 47 N for 1C 36 36 N for R1S 41 41 N for R1C 34 34 1S Coeff -1.952726236 -4.174717322 IC Coeff -4.009830911 -4.280992887 R1S Coeff 0.060946658 -0.901924172 R1C Coeff -0.84027985 -2.098708096 Var for 1S 3.881459118 4.222990696 Var for 1C 2.589180286 2.578813072 Var for R1S 4.019024218 3.952029957 Var for R1C 4.61471327 4.991890592
based on the underlying data:
Method N N R R Subset S C S C
obsN 47 36 41 34 Mean u 0.615 0.501 0.540 0.558 Mean u^2 0.394 0.293 0.315 0.335
And speaking from my usual complete ignorance, I would say that the similarity of t,df,p for Aubu and Aubqu at the ?2-way? level is sufficient to:
a) rule out any need for further analysis at the ?underlying? level;
b) motivate the choice of c on (u,e,u*e) over c on (u,e,u*e,u^2) because complicating the regression by addition of u^2 doesn?t seem to make any appreciable difference, at least not at the ?2-way level?.
But if these conclusions are incorrect, I await your guidance and instructions.
?3. What does "Het" *mean*? I'm always suspicious of anything that starts with arbitrary dichotomization. What are you trying to show??
I will make a separate post in response to this question.