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Re: st: reading dataset if
From
Nick Cox <[email protected]>
To
[email protected]
Subject
Re: st: reading dataset if
Date
Wed, 21 Sep 2011 23:12:12 +0100
You are reaching towards some kind of regular expression test but ==
is a test for equality.
use dataset.dta if inlist(substr(diagp,1,1), "I", "J")
use dataset.dta if substr(diagp,1,1) == "I" | substr(diagp,1,1) == "J"
Regular expressions are also possible here:
. di regexm("Janvier", "^[IJ]")
1
. di regexm("jeunesse", "^[IJ]")
0
. di regexm("Jeunesse", "^[IJ]")
1
use dataset.dta if regexm(diagp, "^[IJ]")
On Wed, Sep 21, 2011 at 10:46 PM, Emmanuelle Lavaine
<[email protected]> wrote:
> I have a huge dataset and I would like to get rid of some observations
> when opening it.
> I want to open my dataset only if the first character corresponds to
> 'I' or 'J'
> for the string variable 'diagp', I have something like:
>
> diagp
> I236
> I256
> I52
> J46
> J856
> H343
> etc..
>
> I tried:
> use 'dataset.dta' if diagp=="[I-J]*"
>
> But I am doing something wrong and I can't figurate it out.
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