Isaac posted on Thursday, April 30, 2009 - 2:17 am
I'm running 4 class splitplot with 2 knots. I am trying to follow Flora's recent article in SEM. I've run the same model with two different data sets and each time I get error of a no-positive cov matrix. Also, one class drops to 0% with and I and S at 0. I'm posting my syntax. Any thoughts?
Hi linda, I've been able to work out the previous problem however a new problem has emerged and I wanted to get your advice. When running a piecewise model, the final class consistantly displays a Mean for the slopes as: S1 0.000 0.000 999.000 999.000 S2 0.000 0.000 999.000 999.000 This occurs regardless of which class is the final class and does not change if I use starting values. Any thoughts? Also, I have a large class(both in percentage and number of subjects) with a significant slope that is relatively flat. There's a decrease in estimated means of roughly .4 on a 9 point scale over 4 time points. Could the significance of the slope be effected by the size of the class? If so, is there a way to adjust for size or ascertain an effect size for the slope?