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Re: st: Cutpoints and Data


From   Allen Buxton <abbuxton@pacbell.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Cutpoints and Data
Date   Sun, 30 Nov 2003 17:40:56 -0800 (PST)

You might try checking the command "egen"

egen group_varA = cut(varA) , group(x) label

this will group varA into x groups with approx. the
same frequency. Is this what you wish to do?

-Allen Buxton


--- tpolcyn <tpolcyn@dal.ca> wrote:
> Hello,
> After many unfruitful hours perusing STATA manuals
> and the Archives, I thought 
> it might be best to query the knowledgeable group on
> the listserve.
> 
> One of my independent variables for my panel dataset
> ranges from a scale of 1 
> to 7.  My professor therefore suggested that I
> investigate ologit and oprobit 
> models for my regressions.  Unfortunately, my
> dependent variables are 
> uncooperative in this respect because they all have
> a range of more than 50 
> categories.
> 
> I have looked at a kdensity of my dependent
> variables and used the tabulate 
> command for assistance in determining where to
> impose cut points.  I am aware 
> of "hordered" which performs a Hausman-type
> specification test whether 
> categories in a ologit or oprobit model can be
> joined or dropped. To this end 
> it estimates another ologit/oprobit model with a
> collaped response.
> 
> My question though is how do I go about grouping my
> data? How do I divide my 
> data into for example three ordered groups? I think
> I am missing some basic 
> STATA manipulation....
> 
> Many thanks,
> Tania Polcyn
> 
> Master's of Development Economics
> Dalhousie University
> Halifax, Canada
> 
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