Mplus Users Guide v6.. - Muthén & Muthén

TITLE, DATA, VARIABLE, And DEFINE Commandswhere u1, u2, u3, and u4 are the names of the new set of binaryvariables.For TYPE=MISSING, the number of binary indicators is equal to thenumber of variables in the NAMES statement. For TYPE=SDROPOUTand TYPE=DDROPOUT, the number of binary indicators is one lessthan the number of variables in the NAMES statement because dropoutcannot occur before the second time point an individual is observed.TYPEThe TYPE option is used to specify how missingness is coded. It hasthree settings: MISSING, SDROPOUT, and DDROPOUT. The defaultis MISSING. For the MISSING setting, a binary missing data indicatorvariable is created. For the SDROPOUT setting, which is used withselection missing data modeling, a binary discrete-time (event-history)survival dropout indicator is created. For the DDROPOUT setting,which is used with pattern-mixture missing data modeling, a binarydummy dropout indicator is created. The TYPE option is specified asfollows:TYPE = SDROPOUT;Following are the rules for creating the set of binary variables for theMISSING setting:1. If the value of the original variable is missing, the new binaryvariable value is one.2. If the value of the original variable is not missing, the new binaryvariable value is zero.For the SDROPOUT and DDROPOUT settings, the set of indicatorvariables is defined by the last time point an individual is observed.Following are the rules for creating the set of binary variables for theSDROPOUT setting:1. The value one is assigned to the time point after the last time pointan individual is observed.2. The value missing is assigned to all time points after the value ofone.473