st: overidentification test for Hausman-Taylor estimation

["dora sepour" <dora05@gnet.tn>]

Thank you so much for your help for the cross-sectional correlation test 
(xtcsd).

As far as the overidentification test is concerned, i installed first 
xtoverid, then xtivreg2. When i try to run the test xtoverid after an 
Hausman-Taylor estimation, an error message appears"Error-must have ivreg2 
version 2.1.15 or greater installed" r(601)

Thank you,
Dora 
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