st: xi command noomit option

[Jimmy Verner <jverner@earthlink.net>]

Here's what the help file says about the xi command with the noomit  
option:  "noomit prevents xi from omitting groups.  This option  
provides a way to generate an indicator variable for every category of  
one or more variables, which is useful when combined with the  
noconstant option of an estimation command."

Both the following regressions yield no-constant results without  
dropping any dummies, but the p values are different for some of the  
dummy variables:

xi, noomit: dv iv i.dummies, nocon
xi: dv iv i.dummies, nocon

Why is this so?

TIA

Jimmy Verner
Graduate Student
University of Texas at Dallas
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