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st: RE: Re: FW: ipolate and epolate - positive and integer DV


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Re: FW: ipolate and epolate - positive and integer DV
Date   Mon, 4 Sep 2006 18:34:25 +0100

I don't know what you are doing downstream 
of this, but some commands will accept non-integers
even when the variables "should be" integers. 

Nick 
n.j.cox@durham.ac.uk 

Samira Reis
 
> Thank you for your suggestion Nick!
> 
> I had done the "logging, interpolating on the
> logarithmic scale and then antilogging" before
> following what you had suggested to another person in
> the statalist some time ago. However, I thought it
> couldn't work for me because after doing that, values
> were not integer anymore, and my dependent variable is
> a count.
> 
> But now you said also that decimals values may be not
> such a problem, that is, "you would be less worried
> about integer values yourself" then I will probably
> round the interpolated values to integer.
> 
> Thank you very much!
> 
> Samira.
> 
> 
> Samira Reis had difficulty sending this to the list.
> 
> My own suggestion -- so long as all values are
> positive --
> is that Samira should consider logging, interpolating
> on the logarithmic scale and then antilogging.
> 
> Or take square roots -- that doesn't ensure positive
> values either, but there are several grounds for
> regarding square roots as "first aid" (Tukey) for
> count.
> 
> I would be less worried about integer values myself.
> 
> Nick
> n.j.cox@durham.ac.uk
> 
> Samira Reis [mailto:samira_dias@yahoo.com.br]
> 
> Hi Stata users,
> 
> I have a data set from 1980 to 2003 with some missing
> values for both
> dependent and independent variables. I tried using
> ipolate command in
> stata to get values and I used:
> 
> by reg: ipolate ent year, gen (ient) epolate.
> 
> The problem was that I obtained quite a few negative
> values and my
> variables can not be negative and my dependent
> variable must be integer
> as well. Could anybody help me to find out a
> correct way to deal with that, please?

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