st: xi3 command

["Eamonn O'Brien" <Eamonn.O'Brien@icr.ac.uk>]

I am trying to work through the exercises found at
http://www.ats.ucla.edu/stat/stata/webbooks/reg/chapter6/statareg6.htm
.
However the regress command with the xi3 prefix seems to no longer be
available has if been superseded?
Thanks

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