The MBC Procedure

The INIT statement specifies the variables that contain initial weights for the mixture components. By convention, if the model includes a noise component, the first variable in the INIT statement list defines the observation’s initial weight for the noise component. If you are fitting many different models by using the NCLUSTERS=, NOISE=, or COVSTRUCT= option, you must supply enough INIT variables for the model combination that has the most components. The INIT statement is not required. Without an INIT statement, PROC MBC uses the default initialization method.