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Mplus Discussion > Structural Equation Modeling >
Message/Author
 Hoon Lee posted on Tuesday, August 07, 2012 - 2:31 pm
Dear Dr. Muthen,

I am running a moderated mediation model, which includes one mediator and two moderators. I am wondering if I can obtain bias-correct CIs for inidrect effects at different levels of moderators. Just in case, I am attaching the Mplus code that I am currently using. Thank you very much in advance.

DATA:
FILE = M:\2008 2010 mplus.dat;
FORMAT is FREE;

VARIABLE:
names = age gen edu inc pin pst npf tvf onl tal mhe mpr par cro ief;
usevariables = age gen edu inc pin pst npf tvf onl tal mhe mpr par cro ief mv xw;
missing = all(999);
DEFINE:
mv = cro*ief;
xw = mhe*mpr;
ANALYSIS:
!type = basic;
bootstrap = 5000;

MODEL:
par on cro(b1)
age
gen
edu
inc
pin
pst
npf
tvf
onl
tal
mhe
mpr
ief
mv(b3)
xw;

cro on mhe(a1)
age
gen
edu
inc
pin
pst
npf
tvf
onl
tal
mpr
xw(a3);

MODEL CONSTRAINT:
new (ind wmodval vmodval);
wmodval = 1;
vmodval = 1;
ind=(a1+a3*wmodval)*(b1+b3*vmodval);

output:
cinterval (bcbootstrap);
sampstat standardized;
 Linda K. Muthen posted on Tuesday, August 07, 2012 - 7:25 pm
I don't believe we give confidence intervals for NEW parameters in MODEL CONSTRAINT. You should try it out to be sure.
 Hoon Lee posted on Tuesday, August 07, 2012 - 8:37 pm
Thank you so much for your prompt response. I tried out the above syntax and found that it produced a bc CI for the new paramenter ("ind"). However, it only produced an unstrandardized CI for that, and I am still wondering if there is a way to command Mplus to produce a standardized CI. Thank you very much again!
 Linda K. Muthen posted on Tuesday, August 07, 2012 - 8:48 pm
There is no option to expand the CINTERVAL option. Everything available is given.
 Bengt O. Muthen posted on Tuesday, August 07, 2012 - 8:54 pm
You would have to define the standardized indirect effect yourself in Model Constraint.
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