hello everyone
i intend to use PPMLHDFE model for my dataset with 187 observations.
my DV is bilateral trade and my variable of interest is "no.of disputes"
the command i currently operate is
ppmlhdfe tradebillionus disputes rtas , a(imp#year exp#year imp#exp) cluster(imp#exp)
and the results i get is "insufficient observations"
i am new to the stata so i need help for
1. all diagnostic tests and their commands
2. new variables that i may need to create for PPMLHDFE command
3. finally the PPMLHDFE command itself.
thanks.....will be really gratefull
dataset file has been attached.