xtoverid (overidentifying restrictions for panel iv estimation)

[Gaurav Bhattacharya]

Dear All,

When I run the xtoverid command for the Sargan test in panel iv estimation, stata says:

. xtoverid
xtoverid error: internal reestimation of eqn differs from original

Please help!

[Carlo Lazzaro]

Gauray:
googling with "xtoverid error: internal reestimation of eqn differs from original" gives back many potentially promising entries.

[Gaurav Bhattacharya]

Thank you, Carlo! Figured out the issue.