Mplus Users Guide v6.. - Muthén & Muthén

CHAPTER 17[y1-y4@0 i s q];If the | symbol is used to specify the same growth model for a continuousoutcome, the MODEL command is:MODEL:i s q | y1@0 y2@1 y3@2 y4@3;All of the other specifications shown above are done as the default. Thedefaults can be overridden by mentioning the parameters in the MODELcommand after the | statement. For example,MODEL:i s q | y1@0 y2@1 y3@2 y4@3;[y1-y4] (1);[i@0 s q];changes the parameterization of the growth model from one with theintercepts of the outcome variable fixed at zero and the growth factormeans free to be estimated to a parameterization with the intercepts ofthe outcome variable held equal, the intercept growth factor mean fixedat zero, and the slope growth factor means free to be estimated.Many other types of growth models can be specified using the | symbol.Following is a table that shows how to specify some of these growthmodels using the | symbol and also how to specify the same growthmodels using the BY option and other options. All examples are forcontinuous outcomes unless specified otherwise.Intercept onlyLinearLinear with freetime scoresMODEL:i | y1-y4;Growth LanguageMODEL:i s | y1@0 y2@1 y3@2 y4@3;MODEL:i s | y1@0 y2@1 y3 y4;AlternativeMODEL:i BY y1-y4@1;[y1-y4@0 i];MODEL:i BY y1-y4@1;s BY y1@0 y2@1 y3@2 y4@3;[y1-y4@0 i s];MODEL:i BY y1-y4@1;s BY y1@0 y2@1 y3 y4;[y1-y4@0 i s];602