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Re: st: finding non-numeric characters before I can destring


From   "Ben Jann" <ben.jann@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: finding non-numeric characters before I can destring
Date   Thu, 18 Oct 2007 10:23:09 +0200

Type

gen byte notnumeric = real(number)==.

to compute an indicator for the obs without numeric values.

Alternatively, if you want to define flexible rules for valid imputs,
you can use regular expressions, e.g.

gen byte notnumeric = regexm(number, "^[-+]?[0-9]*\.?[0-9]+$")==0

See, e.g., http://www.regular-expressions.info/ on regular expressions.

ben

On 10/18/07, Michael McCulloch <mm@pinest.org> wrote:
> Hello,
> I've got a field that's supposed to be all numbers but due to keying
> errors may contain letters. How can I find those records?
>
> What I've done:
>         . destring number, replace
>
> Error message:
>         number contains non-numeric characters; no replace
>
> Thank you,
> Michael
>
> --
>
> Michael McCulloch
> Pine Street Foundation
> 124 Pine St., San Anselmo, CA 94960-2674
> Tel:    (415) 407-1357
> Fax:    (415) 485-1065
> mcculloch@pinestreetfoundation.org
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