Twolevel random with level-3 cluster ... PreviousNext
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 Kurt posted on Sunday, October 13, 2013 - 3:29 am
Dear all,

I am trying to run the model as below (from Preacher and colleague's mplus multilevel mediation command) and would like to also take into account that my data is clustered within level 3 clusters. While using Type=twolevel random is there anyway that I can take this account? When I used dummy variables for level 3 cluster, it somehow fails to calculates the standard error showing " WARNING: THE SAMPLE COVARIANCE OF THE INDEPENDENT VARIABLES IS SINGULAR. PROBLEM INVOLVING VARIABLE DUMMY_TE." The macro is about testing mediation among level1 IV, level2 Mediator and level2 DV.

TITLE: 1-2-2 mediation (MSEM)
DATA: FILE IS mydata.dat;
VARIABLE: NAMES ARE id x m y;
USEVARIABLES ARE id x m y;
CLUSTER IS id; ! Level-2 grouping identifier
BETWEEN ARE m y;
ANALYSIS: TYPE IS TWOLEVEL RANDOM;
MODEL:
%WITHIN%
x;
%BETWEEN%
m y;
m ON x(a); ! regress m on x, call the slope "a"
y ON m(b); ! regress y on m, call the slope "b"
y ON x; ! regress y on x
MODEL CONSTRAINT:
NEW(indb); ! name the indirect effect
indb=a*b; ! compute the Between indirect effect
OUTPUT: TECH1 TECH8 CINTERVAL;
 Linda K. Muthen posted on Monday, October 14, 2013 - 3:52 pm
If you have three levels, you should use COMPLEX TWOLEVEL or THREELEVEL.
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