st: ivreg vs ivregress

[Jerome Ette <jerome.ette@googlemail.com>]

i always used the command ivreg for 2SLS analysis.
now i recognized that it is termed 'out-of-date' in the current version and
it is recommended to use the function ivregress instead.

when i switch to ivregress i get different inference statistics
than i used to get with ivreg. but of course the first stage
regressions are the same, so are the residuals of both approaches
and further post estimation tests.

here is an replication example from the STATA help files.

webuse hsng2
ivregress 2sls rent pcturban (hsngval = faminc)
ivreg2 rent pcturban (hsngval = faminc)
ivreg rent pcturban (hsngval = faminc)


so why aren't the output tables for all three
commands (ivregress, ivreg2 and ivreg) exactly the same?

what has changed from ivreg to ivregress?

or am i missing an (optional) argument in any of the commands?


thanks!

best
jerome
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