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Mplus Users Guide v6.. - Muthén & Muthén

Mplus Users Guide v6.. - Muthén & Muthén

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CHAPTER 19together to generate missing data. In the second approach, the MISSINGoption is used in conjunction with the MODEL MISSING command togenerate missing data. The approaches cannot be used in combination.When generated data are saved, the missing value flag is 999. ThePATMISS and PATPROBS options are not available for multiple groupanalysis. For multiple group analysis, missing data are generated usingthe MISSING option in conjunction with the MODEL MISSINGcommand. These options are described below.PATMISSThe PATMISS option is used to specify the missing data patterns andthe proportion of data that are missing to be used in missing datageneration for each dependent variable in the model. Any variable in theNAMES statement that is not listed in a missing data pattern is assumedto have no missing data for all individuals in that pattern. ThePATMISS option is used in conjunction with the PATPROBS option.The PATMISS option is specified as follows:PATMISS = y1 (.2) y2 (.3) y3 (.1) |y2 (.2) y3 (.1) y4 (.3) |y3 (.1) y4 (.3);The statement above specifies that there are three missing data patternswhich are separated by the | symbol. The number in parenthesesfollowing each variable is the probability of missingness to be used forthat variable in data generation. In the first pattern, y1, y2, y3 areobserved with missingness probabilities of .2, .3, and .1, respectively. Inthe second pattern, y2, y3, y4 are observed with missingnessprobabilities of .2, .1, and .3, respectively. In the third pattern, y3 and y4are observed with missingness probabilities of .1 and .3, respectively.Assuming that the NAMES statement includes variables y1, y2, y3, andy4, individuals in the first pattern have no missing data on variable y4;individuals in the second pattern have no missing data on variable y1;and individuals in the third pattern have no missing data on variables y1and y2.PATPROBSThe PATPROBS option is used to specify the proportion of individualsfor each missing data pattern to be used in the missing data generation.698

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