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Re: st: xtpoisson -- error


From   Richard Williams <richardwilliams.ndu@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: xtpoisson -- error
Date   Mon, 14 Nov 2011 18:24:53 -0500

At 06:01 PM 11/14/2011, Ivan Png wrote:
Dear STATAlist:

I'm running xtpoisson and keep encountering an error message
"factor variables and time-series operators not allowed in option xvars()"

My code:

. global explvar bkval_ln mktval_ln revt_ln at_ln
. global fixedeff i.sic i.year

. set matsize 1000
. xtset gvkey year

. xi: xtpoisson move cnc_alt $explvar $fixedeff , fe i(gvkey) vce(robust)

I'm using STATA-11.  It runs through about 12 iterations then stops,
giving me the error message,
""factor variables and time-series operators not allowed in option xvars()".

I would appreciate your help.

According to the Stata 11 update 01jul2010, "xtpoisson with options fe and vce(robust) failed when factor variables were used. This has been fixed." So, my guess is you don't have the most current version of Stata. On my computer,

. update query
(contacting http://www.stata.com)

Stata executable
    folder:               C:\Program Files (x86)\Stata11\
    name of file:         StataSE-64.exe
    currently installed:  01 Sep 2011
    latest available:     01 Sep 2011

Ado-file updates
    folder:               C:\Program Files (x86)\Stata11\ado\updates\
    names of files:       (various)
    currently installed:  01 Sep 2011
    latest available:     01 Sep 2011

Utilities updates
    folder:               C:\Program Files (x86)\Stata11\utilities
    names of files:       (various)
    currently installed:  01 Sep 2011
    latest available:     01 Sep 2011

Recommendation
    Do nothing; all files up to date.



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Richard Williams, Notre Dame Dept of Sociology
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EMAIL:  Richard.A.Williams.5@ND.Edu
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