Mplus Users Guide v6.. - Muthén & Muthén

CHAPTER 15WIDEThe WIDE option is used to identify sets of variables in the wide formatdata set that will be converted into single variables in the long formatdata set. These variables must be variables from the NAMES statementof the VARIABLE command. The WIDE option is specified as follows:WIDE = y1-y4 | x1-x4;where y1, y2, y3, and y4 represent one variable measured at four timepoints and x1, x2, x3, and x4 represent another variable measured at fourtime points.LONGThe LONG option is used to provide names for the new variables in thelong format data set. There should be the same number of names asthere are sets of variables in the WIDE statement. The LONG option isspecified as follows:LONG = y | x;where y is the name assigned to the set of variables y1-y4 on the WIDEstatement and x is the name assigned to the set of variables x1-x4.IDVARIABLEThe IDVARIABLE option is used to provide a name for the variable thatprovides information about the unit to which the record belongs. Inunivariate growth modeling, this is the person identifier which is used asa cluster variable. The IDVARIABLE option is specified as follows:IDVARIABLE = subject;where subject is the name of the variable that contains information aboutthe unit to which the record belongs. This option is not required. Thedefault variable name is id.466