Planned comparisons of slopes PreviousNext
Mplus Discussion > Growth Modeling of Longitudinal Data >
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 Wu wenfeng posted on Sunday, December 12, 2010 - 10:24 am
Dear all, I did a HLM of longitudinal data, and discovered a three way interaction among gender, cognitive style and stress to predict depression, so I rerun the model(without gender) in both male and female, and estimate the slope of regression line of "high cognition high stress","high cognition low stress", and so on, I got the estimate values of slopes, their standard error and free degree(df). Now I want to do a planned comparison of the slopes, unfortunately,I don't know how to do, does any kind person to help me? thank you!
 Linda K. Muthen posted on Sunday, December 12, 2010 - 4:43 pm
You can use chi-square or loglikelihood difference testing of the model where the slopes are free versus the model where the slopes are constrained to be equal or you can use MODEL TEST.
 Wu wenfeng posted on Sunday, December 12, 2010 - 10:44 pm
Thanks for your advice!
I run the Model in male and female respectively,if used chi-square or loglikelihood difference testing of the model, I just can compare the slopes difference in male or female.I hope to compare the slopes difference between male and female, how to do this? thanka again!
 Linda K. Muthen posted on Sunday, December 12, 2010 - 11:35 pm
You need to do a multiple group analysis where gender is the grouping variable.
 Wu wenfeng posted on Monday, December 13, 2010 - 1:41 am
thanks
 Wu wenfeng posted on Monday, December 13, 2010 - 10:09 am
Sorry to disturb you again!
If I know the estimate value of slopes of regression linear, their standard error and the free degree(df), can I do significant difference test of slopes? how to do this? thanks for your any advice!
 Linda K. Muthen posted on Monday, December 13, 2010 - 3:07 pm
If you want to do this by hand, you can do a z-test. You can find the formula in any basic statistics book.
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