Hi everyone,
currently I am investigating a regression model with nonlinear moderating effect (XZ²):
Array
The significance of b5 indicates a nonlinear moderating effect between X and Y (see Dawson 2014).
Given the significance of this effect, I am wondering if the effect can be tested using the "utest.ado" by typing the follwoing:
utest XZ XZ², fieller level(90)
Furthermore I am wondering if the turning point of the emerging curve can be calculated as follows:
di -_b[XZ]/(2 * _b[XZ²])
Can anyone help in that regard?
Best Regards
Johannes
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