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Launch Model with Categorical Contrasts |
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I am trying to determine differences in growth trajectory for three predefined groups. I have a working Launch Model and there is a significant group effect on the slope and frailty factors. I wanted to test differences between groups using one group as the comparison group. You can see that I have defined one group as the contrast group in the define statement. However, Mplus stops me from running this analysis due to missing values. However, this is exactly what I am testing and this is how a two-part model is set up. A large number of cases WILL be missing. What is the proper procedure here?? *** ERROR One or more variables in the data set have no non-missing values. Check your data and format statement. |
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define: if wpar==2 then earlyl=1; if wpar==0 then earlyl=0; if wpar==1 then midl=1; if wpar==0 then midl=0; MODEL: !Launch Model; !frailty factor for dichotomous variables; frailty by L_D2@1 L_D3@1 L_D4@1 L_D5@1 L_D6@1 L_D7@1; !Setting frailty intercept to 0; [frailty@0]; !Setting threshold to 0 for wave 7; [L_D7$1@0]; ic sc | L_ln_C1@0 L_ln_C2* L_ln_C3* L_ln_C4* L_ln_C5* L_ln_C6* L_ln_C7@1; !Constrain within-time intercepts to 0 for c variables for identification; [L_ln_C1@0 L_ln_C2@0 L_ln_C3@0 L_ln_C4@0 L_ln_C5@0 L_ln_C6@0 L_ln_C7@0]; !Constraining variance of C1 to 0; L_ln_C1@0; frailty with ic@0; frailty with sc; ic with sc@0; frailty ic sc on earlyl midl ; |
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Please send to support along with your license number and clarify if you refer to "two-part" growth modeling as described in the Mplus V7 UG. |
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