I did mediation and moderation of one model in these programs. Mediation results were the same, but moderation in PROCESS was different: while in SPSS both variables were significant (p=0.001), in PROCESS the significance of the X dropped, and the M became insignificant, while the moderator was the same as in the SPSS model (p=0.043), R^2 is the same in both models. Why is that, what can be the cause, and what to do with that?
Thank you.
The syntax and the output:
process vars = anx fear pp
/ y = anx
/ x = fear
/ m = pp
/ model = 1.
Sample size
200
**************************************************************************
Outcome: anx
Model Summary
R R-sq MSE F df1 df2 p
,3787 ,1434 1,3309 10,9390 3,0000 196,0000 ,0000
Model
coeff se t p LLCI ULCI
constant 1,4323 1,4426 ,9929 ,3220 -1,4127 4,2773
pp ,1403 ,3823 ,3669 ,7141 -,6137 ,8942
fear 1,0208 ,3789 2,6942 ,0077 ,2736 1,7680
int_1 -,1998 ,0978 -2,0418 ,0425 -,3927 -,0068
Product terms key:
int_1 fear X pp
R-square increase due to interaction(s):
R2-chng F df1 df2 p
int_1 ,0182 4,1691 1,0000 196,0000 ,0425
*************************************************************************
Conditional effect of X on Y at values of the moderator(s):
pp Effect se t p LLCI ULCI
3,1413 ,3932 ,0931 4,2239 ,0000 ,2096 ,5768
3,7832 ,2650 ,0660 4,0179 ,0001 ,1349 ,3951
4,4251 ,1368 ,0890 1,5365 ,1260 -,0388 ,3123
My SPSS is in Russian, but I think you will understand, what is where