Hi, I have data with 29 participants. i used the following model: IV1 = Time (3 time points, used as a CLASS) IV 2 = brain activity (3 time points, **centered using baseline coding (i sbstracted the first time point from the rest). DV = level of extraversion. my script ran as followed: PROC MIXED method=ml DATA= _exp0_.Amygdala_acc_hipp_2 COVTEST; CLASS ORDER time; MODEL E = time| Amygdala_dev /s ddfm=bw s outpm =data covb; random intercept /subject = ORDER; run; for using baseline as a refrence point, i coded the baseline time point as "2". because of the centering, it means that the brain activity values in this time point equal to zero. this is the output i recieve: 2 = before 1 = after 0 = during estimates: 33.0690 1.0009 28 33.04 <.0001 -1.9631 0.8678 52 -2.26 0.0279 -2.1397 0.8883 52 -2.41 0.0196 0 . . . . Amygdala_dev - 3.2427 1.8508 52 1.75 0.0857 Amygdala_dev*time -5.3499 2.4557 52 -2.18 0.0339 0 . . . . 0 . . . from what i understand, the estimate in the line "Amygdala_dev" represents the simple slope of my refrence point (which is the first time point). given the fact that there not suppose to be any slope on this time point (data is set to sero at this point) - why do i get the estimate 3.2427? when i use different coding - such that the refrence point is set to the third time point i get the same estimate. please help me figure out how to interpret this output. thank you from advance, noa
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