After ivreg2, e(first) can be used. Then, I want to use
Code:
[#,#]
right after the saved e(first) to access regression information.

Code:
sysuse auto
ivreghdfe price weight  (length turn=gear_ratio displacement), ffirst
mat FIRST=e(first)
estadd scalar fstat=FIRST[1,1]
But how can I know at which point what exists? That is, how can I tell whether to do FIRST[2,1] or FIRST[3,1]? Help file doesn't seem to have that.