Hi guys,
I need to examine the impacts of X on Raw Return and Alpha in two sub groups : outflow and inflow.
However, I do not know how test on whether the difference of coefficient is significant.
Could guys please let me know how to test the difference of coefficients by Stata?
Thank you so much in advance!

P.s: This is my table:
Dep.Var= Raw Return Alpha
Outflow Inflow Outflow Inflow
(1) (2) (3) (4)
Varibale X -0.094*** 0.004 -0.056*** -0.031
(-4.96) (0.10) (-3.50) (-1.10)