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Re: st: GET SAMPLES IN STATA


From   Joseph Coveney <jcoveney@bigplanet.com>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   Re: st: GET SAMPLES IN STATA
Date   Mon, 09 Feb 2004 21:17:25 +0900

I forgot to mention that -<command> if !training- conveniently uses your
holdout sample after you've finished with the training.  So, the command
stream  would be:

set seed <seed>
generate byte training = uniform() < 0.33
<command> if training
*
* then, to use the holdouts after stepwise regression or whatever
*
<command> if !training
*
* or
*
<command> if ~training

Joseph Coveney

----------------------------------------------------------------------------
I wrote:

>You can flag training samples by -generate byte training = (uniform() <
X)-,
>where X is the percentage of the total dataset that you want to use for
>training.  So, for example, if you want to use 33% for training and keep
the
>remaining 67% for holdout, then the commands would be:
>
>set seed <seed>
>generate byte training = uniform() < 0.33
><command> if training
>
>Joseph Coveney
>
>
>---------------------------------------------------------------------------
>sgsr100 wrote:
>
>>Hi,
>>Do you know how can a get a training sample randomly chosen from stata
>>and how can I keep the remaining observations as a holdout sample.
>>Thanks,
>>Sandra







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