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

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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

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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

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