How to make test of highest order unconditional interation

[Jose Tavares]

Dear All,
I made the moderation effects using 2 sls model.
So i need to know how much R Squared change due to iterations terms? How much effect left after iteration terms?
Which command can i used ?
Someone can help?

Best regards
José Tavares

[Jose Tavares]

Dear all,
Is possible to get R squared due to iteration in Stata like spss output below?

best regards