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Re: st: editing string variables to remove letters and keep only numbers
From
Michael McCulloch <[email protected]>
To
[email protected]
Subject
Re: st: editing string variables to remove letters and keep only numbers
Date
Mon, 17 Jun 2013 16:51:45 -0700
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
> [email protected]
>
>
> On 17 June 2013 23:53, Michael McCulloch <[email protected]> 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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