data/r13/nlswork
xtset idcode year
xtreg ln_wage c.wks_ue##c.wks_ue union age, fe coeflegend-------------------------------------------Interval]
-------------+-----------
__TBB_TryLockByte(unsigned char &) Line 917 C++ UE4Editor-CoreUObject.dll!FFrame::Step(UObject *) Line 319 C++
UE4Editor-CoreUObject.dll!FFrame::Step(UObject *) Line 31