Difference in Difference method

[andrea iacono]

Hi everyone, I'm new, so I apologize for making some mistakes.
I have this excel file with this data. I wanted to run a DID regression to analyze the effect of the RBI starting from 2014 on the FdI stock regarding the listed countries. I run the command:
didregress (FdIst) (RBI), group(FdIst) time(time)
But I recived the following message: group variable FdIst may not contain noninteger or negative values
Any ideas about how to run this smoothly?
Thank you for your help! DID method.xlsx

[Jared Greathouse]

Please, do read the FAQ. It'll show you how to ask questions, as well as present your data to us

[Joro Kolev]

Also look up the help file of -didregress-.

Your syntax

didregress (FdIst) (RBI), group(FdIst) time(time)

is specifying the same variable as group variable and outcome variable. This cannot be right.