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Mplus Users Guide v6.. - Muthén & Muthén

Mplus Users Guide v6.. - Muthén & Muthén

Mplus Users Guide v6.. - Muthén & Muthén

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TITLE, DATA, VARIABLE, And DEFINE Commandsdata set name. For example, if five data sets are being analyzed, thecontents of the file would be:imp1.datimp2.datimp3.datimp4.datimp5.datwhere imp1.dat, imp2.dat, imp3.dat, imp4.dat, and imp5.dat are thenames of the five data sets created using multiple imputation.NOBSERVATIONSThe NOBSERVATIONS option is required when summary data areanalyzed. When individual data are analyzed, the program counts thenumber of observations. The NOBSERVATIONS option can, however,be used with individual data to limit the number of records used in theanalysis. For example, if a data set contains 20,000 observations, it ispossible to analyze only the first 1,000 observations by specifying:NOBSERVATIONS = 1000;NGROUPSThe NGROUPS option is used for multiple group analysis whensummary data are analyzed. It specifies the number of groups in theanalysis. It is specified as follows:NGROUPS = 3;which indicates that the analysis is a three-group analysis. Multiplegroup analysis is discussed in 14.LISTWISEThe LISTWISE option is used to indicate that any observation with oneor more missing values on the set of analysis variables not be used in theanalysis. The default is to estimate the model under missing data theoryusing all available data. To turn on listwise deletion, specify:459

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