Mplus Users Guide v6.. - Muthén & Muthén

TITLE, DATA, VARIABLE, And DEFINE Commandsprimary sampling unit. In the example above, the clusters forTYPE=TWOLEVEL are household. The standard error and chi-squarecomputations for TYPE=COMPLEX are based on the psu clusters.Following is an example with stratification and a one-stage clusterdesign:STRATIFICATION = region;CLUSTER = school;where the standard error and chi-square computations forTYPE=COMPLEX are based on region and the clusters forTYPE=TWOLEVEL are schools.If a stratum has a single primary sampling unit, the variance contributionfor this cluster is based on the difference between the single clustervalue and the overall cluster mean.WEIGHTThe WEIGHT option is used to identify the variable that containssampling weight information. Sampling weights are used when datahave been collected with unequal probabilities of being selected.Sampling weight values must be non-negative real numbers. If the sumof the sampling weights is not equal to the total number of observationsin the analysis data set, the weights are rescaled so that they sum to thetotal number of observations. Sampling weights are available for allanalysis types. Sampling weights are available for ESTIMATOR=MLR,MLM, MLMV, WLS, WLSM, WLSMV, and ULS and forESTIMATOR=ML when the BOOTSTRAP option of the ANALYSIScommand is used. There are two exceptions. They are not available forWLS when all dependent variables are continuous and are not availablefor MLM or MLMV for EFA. Following is an example of how theWEIGHT option is used to identify a sampling weight variable:WEIGHT IS sampwgt;where sampwgt is the variable that contains sampling weightinformation.501