Mplus Users Guide v6.. - Muthén & Muthén

CHAPTER 19TSCORESThe TSCORES option is used in conjunction with TYPE=RANDOM toname and define the variables to be generated that contain informationabout individually-varying times of observation for the outcome in alongitudinal study. Variables listed in the TSCORES statement can beused only in AT statements in the MODEL and MODEL POPULATIONcommands to define a growth model. They cannot be used with otherstatements in the MODEL command. The TSCORES option is specifiedas follows:TSCORES ARE a1 (0 0) a2 (1 .1) a3 (2 .2) a4 (3 .3);where a1, a2, a3, and a4 are variables to be generated that contain theindividually-varying times of observation for an outcome at four timepoints. The first number in parentheses is the mean of the variable. Thesecond number in parentheses is the standard deviation of the variable.Each variable is generated using a univariate normal distribution usingthe mean and standard deviation specified in the TSCORES statement.WITHINThe WITHIN option is used with TYPE=TWOLEVEL to identify thevariables in the data set that are measured on the individual level andmodeled only on the within level. They are specified to have novariance in the between part of the model. The WITHIN option isspecified as follows:WITHIN = y1 y2 x1;where y1, y2, and x1 are variables measured on the individual-level(within).BETWEENThe BETWEEN option is used with TYPE=TWOLEVEL to identify thevariables in the data set that are measured on the cluster level andmodeled only on the between level. The BETWEEN option is specifiedas follows:BETWEEN = z1 z2 x1;706