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Re: st: Recoding missing variables


From   Ashwin Ananthakrishnan <ashwinna@yahoo.com>
To   Robert Brummett <brummettr@gmail.com>
Subject   Re: st: Recoding missing variables
Date   Sat, 15 Jul 2006 20:23:36 -0700 (PDT)

Thanks for the reply. I do not want to drop the entire
observation as it has nonmissing values for some other
variables. For examples,


        var1     outcome1 var3   var4
obs1     1         2       7     99
obs2     99        99      3      1
obs3      0         2       5     4
obs4      1         0       99    99


For analyses of var1 , i want to include obs1, 3, 4
and for var 3 - obs 1,2, and 3.

However, when i run the regression for outcome1
against var1, var3 or var4, I do not want the "99" to
be included as a legitimate coding for those variables
and hence influence the odds ratio estimate.

Hope that clarifies my question a bit.

Thanks,
Ashwin







--- Robert Brummett <brummettr@gmail.com> wrote:

> Ashwin,
> 
> I assigned missing values as ".m" (similar to your
> 99) in one of my
> datasets.
> 
> All you have to do is use the "drop" command.
> 
> In your script, before your tables or regression
> script, type:
> 
> drop if variablex == 99
> 
> where you would replace your variable name for
> "variablex".
> 
> This assumes you would not want to use those
> observations for other analysis
> (where other variables may be included you don't
> want to drop).
> 
> There are other ways to ignore those with this
> value, and this assumes that
> no non-missing values are 99 in this variable.
> 
> Let me know if this helps or if you want more ideas
> (other ways are not
> really more complex, but take more time to describe.
> 
> Good luck,
> Robert
> 
> 
> 
> On 7/15/06, Ashwin Ananthakrishnan
> <ashwinna@yahoo.com> wrote:
> >
> > Hi,
> >
> > I have a dataset where currently missing values
> are
> > labelled 99 for all variables (which usually have
> > values between 1-15). Is there anyway I can get
> stata
> > to recognize the value 99 as missing variables so
> that
> > they are not included in tables or in regression?
> >
> > Thanks,
> > Ashwin
> >
> >
> >
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