[ENH] add more tests on GAM with interaction terms #73
Description
-
s(x) + s(y) + ti(x,y) -
ti(x, fx=TRUE) + ti(y, fx=FALSE) + ti(x, y, fx=TRUE), i.e., including smooth terms withfx=FALSE
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s(x) + s(y) + ti(x,y)ti(x, fx=TRUE) + ti(y, fx=FALSE) + ti(x, y, fx=TRUE), i.e., including smooth terms with fx=FALSE