Mplus Users Guide v6.. - Muthén & Muthén

CHAPTER 9EXAMPLE 9.17: TWO-LEVEL GROWTH MODEL FOR ACOUNT OUTCOME USING A ZERO-INFLATED POISSONMODEL (THREE-LEVEL ANALYSIS)TITLE: this is an example of a two-level growthmodel for a count outcome using a zeroinflatedPoisson model (three-levelanalysis)DATA: FILE = ex9.17.dat;VARIABLE: NAMES = u1-u4 x w clus;COUNT = u1-u4 (i);CLUSTER = clus;WITHIN = x;BETWEEN = w;ANALYSIS: TYPE = TWOLEVEL;ALGORITHM = INTEGRATION;INTEGRATION = 10;MCONVERGENCE = 0.01;MODEL: %WITHIN%iw sw | u1@0 u2@1 u3@2 u4@3;iiw siw | u1#1@0 u2#1@1 u3#1@2 u4#1@3;sw@0;siw@0;iw WITH iiw;iw ON x;sw ON x;%BETWEEN%ib sb | u1@0 u2@1 u3@2 u4@3;iib sib | u1#1@0 u2#1@1 u3#1@2 u4#1@3;sb-sib@0;ib ON w;OUTPUT: TECH1 TECH8;The difference between this example and Example 9.12 is that theoutcome variable is a count variable instead of a continuous variable.The COUNT option is used to specify which dependent variables aretreated as count variables in the model and its estimation and whether aPoisson or zero-inflated Poisson model will be estimated. In theexample above, u1, u2, u3, and u4 are count variables. The i inparentheses following u indicates that a zero-inflated Poisson model willbe estimated.284