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Nobody prevents you from creating the dummies beforehand via -tab, gen()-. The interaction would have to be created by hand, though. See also
*************
ssc d dummieslab
*************
-xi- automatically prevents you from falling into the dummy trap and overrides previously created "_I" vars, which is a neat feature...
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected] [mailto:[email protected]] Im Auftrag von Qiang (Danny) Chen
Gesendet: Montag, 4. Mai 2009 17:40
An: [email protected]
Betreff: st: variable name
Dear Stata users:
I have a simple question here. When I use xi (Interaction expansion), I got the following report. I am wondering if there is a way to keep the original snp names. For example:
_Irs1Xrs~1_1 ==> _Irs1234567_1Xrs7654321_1
Thanks!
xi: logit case sex i.rs1234567*i.rs7654321, or
------------------------------------------------------------------------------
case | Odds Ratio Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
sex | .2390816 .0457164 -7.48 0.000 .1643547 .3477845
_Irs123456~1 | .2017002 .2995979 -1.08 0.281 .010974 3.707226
_Irs123456~2 | .1621226 .2412076 -1.22 0.221 .0087784 2.994125
_Irs765432~1 | .6244084 .9455679 -0.31 0.756 .0320966 12.14728
_Irs765432~2 | .2035963 .3072363 -1.05 0.292 .0105747 3.919879
_Irs1Xrs~1_1 | 2.363021 3.757366 0.54 0.589 .1047126 53.32569
_Irs1Xrs~1_2 | 7.389233 11.69742 1.26 0.206 .3319834 164.4683
_Irs1Xrs~2_1 | 2.471199 3.926579 0.57 0.569 .1097495 55.64331
_Irs1Xrs~2_2 | 6.57177 10.37793 1.19 0.233 .2975032 145.1687
------------------------------------------------------------------------------
Qiang (Danny) Chen, Ph.D.
NIMH, NIH
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