requirements of didregress/ xtdidregress

[Maya Tocamp]

Hi everyone,
I need help from stata 17+ users who have experience in didregress/xtdidregress commands.

I work with administrative data on-site in an institution where internet connection is not available. Are didregress, xtdidregress commands defined in new versions of stata by default? Or is it a user-written command which requires pre-installation from other sources?

I could not find any xtdidregress.ado file in http://fmwww.bc.edu/repec/bocode/x/ but i would like to make sure whether these codes work immediately without any additional installation requirements. Because if these commands require some additional commands, I need to download necessary ado files in-advance before going to the institution as there will be no internet connection there. My own computer has stata 15, so i could not solve the issue myself.

Many thanks for the help.
Best,
Maya.

[Carlo Lazzaro]

Maya:
-didregress- and -xtdidregress- are not included in Stata 15.
Therefor, if your institution does not allow you to update to Stata 17, you may want to take a look at the following slide-kit: https://www.princeton.edu/~otorres/DID101.pdf.

[Maya Tocamp]

Dear Carlo, thanks for the answer and suggesstin.
I have Stata 17 at the institution. I just wanted to know whether the commands need any other requirements. Are didregress/xtdidregress commands defined by default at Stata 17+ ?

[Carlo Lazzaro]

Maya:
yes, they are.
Just type -help didregress- from within Stata to access their helpfile.