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Re: st: editing string variables to remove letters and keep only numbers


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: editing string variables to remove letters and keep only numbers
Date   Tue, 18 Jun 2013 01:02:30 +0100

Yes. The negation is intended. If a character isn't 0 to 9, it's
regarded as a a letter.

Show us the exact code you typed to get a better answer.
Nick
njcoxstata@gmail.com


On 18 June 2013 00:51, Michael McCulloch <mm@pinestreetfoundation.org> wrote:
> Thanks Nick.
>
> On the second inrange argument, does the "!" belong there?
> When I run that forval command, an invalid syntax r(198) code is returned.
>
>
>
> Best wishes,
> Michael McCulloch, LAc MPH PhD
>
> --
> Pine Street Foundation, since 1989
> 124 Pine Street | San Anselmo | California | 94960-2674
> P: (415) 407-1357 | F: (206) 338-2391 | http://www.PineStreetFoundation.org
>
> On Jun 17, 2013, at 4:10 PM, Nick Cox wrote:
>
>> There are is a dedicated functions in -egenmore- (SSC) (-sieve()-)
>> but let's take it from first principles.
>>
>> gen length = length(strvar)
>> su length, meanonly
>> local lmax = r(max)
>>
>> gen numstr = ""
>> gen letterstr = ""
>>
>> forval i = 1/`max' {
>>      replace numstr = numstr + substr(strvar, `i', 1) if
>> inrange(real(substr(strvar, `i', 1)), 0, 9)
>>      replace letterstr = letterstr + substr(strvar, `i', 1) if
>> !inrange(real(substr(strvar, `i', 1)), 0, 9)
>> }
>> Nick
>> njcoxstata@gmail.com
>>
>>
>> On 17 June 2013 23:53, Michael McCulloch <mm@pinestreetfoundation.org> wrote:
>>> I have a variable in my dataset that (due to changes in data entry practices over time) contains several styles of the variable ID:
>>>
>>>        - a number (e.g. 164)
>>>        - a letter-number combination (e.g. e64)
>>>        - a comma-separated letter-number combination (e.g. e64,e65)
>>>
>>> In seeking to (A) remove the letters, and (B) separate the comma-separated into two separate variables, ID1 and ID2, I wrote the following argument:
>>>
>>> . split ID, p(",")
>>> . gen str id1_new =""           // make new ID to separate out the "e" from ID
>>> . replace id1_new=substr(id1,2,3)
>>>
>>>
>>> This successfully splits ID into ID1 and ID2.
>>>
>>> This also works if:
>>>        a 3-digit variable has a preceding letter (e64 is changed to 64)
>>>
>>> However, in the case of a 3-digit values WITHOUT PRECEDING LETTER, the first digit is removed (164 is changed to 64).
>>>
>>> Any suggestions would be appreciated.
>>>
>>>
>>> Best wishes,
>>> Michael McCulloch, LAc MPH PhD
>>>
>>> --
>>> Pine Street Foundation, since 1989
>>> 124 Pine Street | San Anselmo | California | 94960-2674
>>> P: (415) 407-1357 | F: (206) 338-2391 | http://www.PineStreetFoundation.org
>>>
>>>
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