Dear Statalists,
After successfully installing the command xtcointreg using "ssc install xtcointreg", I'm unable to run it on Stata 17.0. The command is "xtcointreg lnAIR lnBERD", and the output "command cointreg is unrecognized r(199);". I therefore tried to install cointreg " ssc install cointreg ", and the output was "ssc install: "cointreg" not found at SSC, type search cointreg". The command xtcointreg still doesn't work.

Any suggestions?

Thank you,
Susanna