Mplus Users Guide v6.. - Muthén & Muthén

Examples: Special Featureswith starting values of one. To assign starting values to y2 and y6, anasterisk (*) followed by a number is placed after y2 and y6. The startingvalue of .5 is assigned to y2, and the starting value of .8 is assigned toy6. The variances of f1 and f2 are free to be estimated as the default.To fix these variances to one, an @ symbol followed by 1 is placed afterf1 and f2 in a list statement. This is another way to set the metric of thefactors.EXAMPLE 13.9: EQUALITIES IN A SINGLE GROUPANALYSISTITLE: this is an example of a CFA withcontinuous factor indicators withequalitiesDATA: FILE IS ex5.1.dat;VARIABLE: NAMES ARE y1-y6;MODEL: f1 BY y1y2-y3 (1-2);f2 BY y4y5-y6 (1-2);y1-y3 (3);y4-y6 (4);This example is based on the model in Example 5.1 where there are noequality constraints on model parameters. In the example above, severalmodel parameters are constrained to be equal. Equality constraints arespecified by placing the same number in parentheses following theparameters that are to be held equal. The label (1-2) following the factorloadings uses the list function to assign equality labels to theseparameters. The label 1 is assigned to the factor loadings of y2 and y5which holds these factor loadings equal. The label 2 is assigned to thefactor loadings of y3 and y6 which holds these factor loadings equal.The third equality statement holds the residual variances of y1, y2, andy3 equal using the label (3), and the fourth equality statement holds theresidual variances of y4, y5, and y6 equal using the label (4).397