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Mplus Users Guide v6.. - Muthén & Muthén

Mplus Users Guide v6.. - Muthén & Muthén

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MODEL CommandMODEL INDIRECT:y3 IND y1 x1;y3 IND y2 x1;y3 IND x2;The first IND statement requests the specific indirect effect from x1 toy1 to y3. The second IND statement requests the specific indirect effectfrom x1 to y2 to y3. The third IND statement requests all indirect effectsfrom x2 to y3. These include x2 to y1 to y3, x2 to y2 to y3, and x2 to y1to y2 to y3.Following is an example of how MODEL INDIRECT can be used torequest indirect effects using the VIA option:MODEL INDIRECT:y3 VIA y1 x1 ;The VIA statement requests all indirect effects from x1 to y3 that aremediated by y1. These include x1 to y1 to y3 and x1 to y1 to y2 to y3.THE MODEL CONSTRAINT COMMANDThe MODEL CONSTRAINT command is used to define linear and nonlinearconstraints on the parameters in the model. These constraints canbe implicit or explicit. The default setting for the INFORMATIONoption of the ANALYSIS command for MODEL CONSTRAINT isOBSERVED. The MODEL CONSTRAINT command is not availablefor TYPE=EFA.LABELING THE PARAMETERS ANDSELECTING VARIABLESThe MODEL CONSTRAINT command specifies parameter constraintsusing labels defined for parameters in the MODEL command, labelsdefined for parameters not in the MODEL command using the NEWoption of the MODEL CONSTRAINT command, and names of observedvariables that are identified using the CONSTRAINT option of theVARIABLE command.615

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