Hello,

Can you help me please with my following issue?
I have a panel data set and I want to figure out how ICT adoption influences Labor productivity.
Therefore I can run the simple regression:

Code:
LaPr dum_ICT firmage l10 c6 b2b i.a4a i.a1
But I want to make a restriction as I am only interested how ICT adoption influences labor productivity in the 2nd year, if the firm had no ICT adoption in Year 1.
So I created the dummies "dum_ICT" for ICT adoption and "dum_NoICT" if a firm had no ICT adoption.
I tried the following command but it didn't work. Can you help me please, how I can approach that?

Code:
  LaPr dum_ICT firmage l10 c6 b2b i.a4a i.a1 if year==2, dum_NoICT(year==1)==0
Kind regards
Dominik