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Re: st: Conditional Counter


From   Gonzalo DURAN SANHUEZA <giduran@puc.cl>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Conditional Counter
Date   Mon, 15 Oct 2012 10:44:31 -0300

Thanks you very much Nick

G


On Mon, Oct 15, 2012 at 10:40 AM, Nick Cox <njcoxstata@gmail.com> wrote:
> At least one 7 is just
>
> count if strpos(nnaadd, "7") > 0
>
> count if strpos(string(nnaadd), "7") > 0
>
> depending on whether -nnaadd- is string or numeric.
>
> A related problem, how many 7s in each observation, is sweet:
>
> If this is a string variable, the number of 7s is
>
> gen sevens = length(nnadd) - length(subinstr(nnadd, "7", "", .))
>
> Reasoning.
>
> 0. Measure the length of your string variable.
>
> 1. Imagine striking out every "7" in your variable.
>
> 2. Now work out how many characters shorter it would be.
>
> If this is not a string variable, work on -string(nnadd)-.
>
> gen sevens = length(string(nnadd)) - length(subinstr(string(nnadd),
> "7", "", .))
>
> See also
>
> SJ-11-2 dm0056  . . . . . . . Stata tip 98: Counting substrings within strings
>         . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
>         Q2/11   SJ 11(2):318--320                                (no commands)
>         tip on counting substrings within strings
>
>
> On Mon, Oct 15, 2012 at 2:28 PM, Gonzalo DURAN SANHUEZA <giduran@puc.cl> wrote:
>> Dear Statalist-Member, I have a variable it contains numbers:
>>
>> nnaadd
>> 1234
>> 3456
>> 6543
>> 7777
>> 777
>> 77
>> 1267
>> ...
>>
>> I need to ask stata to count the number of observations that have at
>> least one 7..
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