10.07.2015 Views

Mplus Users Guide v6.. - Muthén & Muthén

Mplus Users Guide v6.. - Muthén & Muthén

Mplus Users Guide v6.. - Muthén & Muthén

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CHAPTER 17PARAMETERS LABELLED IN THE ANALYSIS MODELParameters in the analysis model are given labels by placing a name inparentheses after the parameter in the MODEL command. Only onelabel can appear on each line of the input file. Following is an exampleof how to use the MODEL command to assign labels to parameters.MODEL:y ON x1 (p1)x2 (p2)x3 (p3);where p1 is the label for the regression of y on x1, p2 is the label for theregression of y on x2, and p3 is the label for the regression of y on x3.The list function can be used to assign labels to parameters. The listfunction for labels can be used only with a list of parameters. Followingis an example of how this is done:MODEL:f BY y1y2-y4 (p2-p4);where the factor loadings for y2, y3, and y4 are assigned the labels p2,p3, and p4, respectively.PARAMETERS LABELLED USING THE NEW OPTIONThe NEW option is used to assign labels and starting values toparameters not in the analysis model. These parameters are used toconstrain the parameters in the analysis model. The default startingvalue for these parameters is 0.5. Following is an example of how theNEW option is specified:MODEL:[y1-y3] (p1-p3);MODEL CONSTRAINT:NEW (c*.6);p2 = p1 + c;p3 = p1 + 2*c;616

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