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.

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