Mplus Users Guide v6.. - Muthén & Muthén

ANALYSIS Commandwhich specifies that for the k-1 class model 2 random sets of startingvalues are used in the initial stage and 1 optimization is carried out in thefinal stage and for the k class model 50 random sets of starting valuesare used in the initial stage and 15 optimizations are carried out in thefinal stage.RSTARTSThe RSTARTS option is used to specify the number of random sets ofstarting values to use for the GPA rotation algorithm and the number ofrotated factor solutions with the best unique rotation function values toprint for exploratory factor analysis. The default is no random sets ofstarting values and printing of the best solution except for the GEOMINrotation which uses 30 sets of random starting values. Following is anexample of how to use the RSTARTS option.RSTARTS = 10 2;which specifies that 10 random sets of starting values are used for therotations and that the rotated factor solutions with the two best rotationfunction values will be printed.DIFFTESTThe DIFFTEST option is used to obtain a correct chi-square differencetest when the MLMV and the WLSMV estimators are used because thedifference in chi-square values for two nested models using the MLMVor WLSMV chi-square values is not distributed as chi-square. The chisquaredifference test compares the H0 analysis model to a lessrestrictive H1 alternative model in which the H0 model is nested. Toobtain a correct chi-square difference test for MLMV or WLSMV, a twostep procedure is needed. In the first step, the H1 model is estimated. Inthe H1 analysis, the DIFFTEST option of the SAVEDATA command isused to save the derivatives needed for the chi-square difference test. Inthe second step, the H0 model is estimated and the chi-square differencetest is computed using the derivatives from the H0 and H1 analyses. TheDIFFTEST option of the ANALYSIS command is used as follows tospecify the name of the data set that contains the derivatives from the H1analysis:553