Replicate results from SPSS PROCESS PreviousNext
Mplus Discussion > Structural Equation Modeling >
Message/Author
 yk leung posted on Wednesday, November 01, 2017 - 3:19 am
Hi there,

I am trying to replicate the results I obtained from model 4 (simple mediation) of the SPSS macro PROCESS. But the results, seems to be very different. Specifically, the indirect effect estimated by PROCESS is highly significant while it is not in Mplus.

I was wondering why would this be the case and more importantly how might I obtain the same result as in PROCESS? Many thanks!!

Code in Mplus:
Mplus code for the model:
! Predictor variable - X
! Mediator variable(s) M
! Moderator variable(s) - none
! Outcome variable - Y
! Control variable - C

USEVARIABLES = X C M Y;

MISSING = ALL(-999);

ANALYSIS:

BOOTSTRAP = 1000;

! In model statement name each path using parentheses
MODEL:
Y ON X C (cdash);
Y ON M (b1);
M ON X C (a1);

! Use model constraint to calculate indirect and total effect

MODEL CONSTRAINT:
NEW(a1b1 TOTAL);
a1b1 = a1*b1; ! Indirect effect of X on Y via M
TOTAL = a1*b1 + cdash; ! Total effect of X on Y

OUTPUT:
STAND CINT(bcbootstrap);
 Linda K. Muthen posted on Wednesday, November 01, 2017 - 9:04 am
Please send the SPSS output in pdf form and the Mplus output along with your license number to support@statmodel.com.
Back to top
Add Your Message Here
Post:
Username: Posting Information:
This is a private posting area. Only registered users and moderators may post messages here.
Password:
Options: Enable HTML code in message
Automatically activate URLs in message
Action: