Mplus Users Guide v6.. - Muthén & Muthén

CHAPTER 18SIGBETWEENThe SIGBETWEEN option is used to specify the name of the ASCII filein which the estimated sigma between covariance matrix or the estimatedsigma between correlation matrix will be saved. For maximumlikelihood estimation, it is the consistent maximum likelihood estimateof sigma between. For weighted least squares estimation, it is thepairwise maximum likelihood estimated sigma between covariance andcorrelation matrices. For ESTIMATOR=MUML, it is the unbiasedestimate of sigma between. Following is an example of how to specifythe SIGB option:SIGBETWEEN IS sigma.dat;where sigma.dat is the name of the file in which the estimated sigmabetween matrix will be saved. If the working directory contains a file ofthe same name, it will be overwritten. The data are saved using freeformat delimited by a space.The default is to save the estimated sigma between covariance matrix.The TYPE option can be used in conjunction with the SIGB option toobtain the estimated sigma between correlation matrix.SWMATRIXThe SWMATRIX option is used with TYPE=TWOLEVEL andweighted least squares estimation to specify the name of the ASCII filein which the within- and between-level sample statistics and theircorresponding estimated asymptotic covariance matrix will be saved.The univariate and bivariate sample statistics are estimated using oneandtwo-dimensional numerical integration with a default of 7integration points. The INTEGRATION option of the ANALYSIScommand can be used to change the default. It is recommended to savethis information and use it in subsequent analyses along with the rawdata to reduce computational time during model estimation. Analysesusing this information must have the same set of observed dependent andindependent variables, the same DEFINE command, the sameUSEOBSERVATIONS statement, and the same USEVARIABLESstatement as the analysis which was used to save the information.Following is an example of how to specify the SWMATRIX option:668