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Re: st: Need help converting values into factor variable
From
Michael Stewart <[email protected]>
To
[email protected]
Subject
Re: st: Need help converting values into factor variable
Date
Sat, 1 Dec 2012 07:44:04 -0500
Dear Nick ,
I apologize for the mistake and not positng the code .
I am trying to decipher the code written by you(sort, I am by no means
and stata expert )
Can you explain what this code is doing; especially the argument (
sum(year != year[_n-1] &
> inrange(year, 2009, 2012))
Thanks a lot Nick
On Sat, Dec 1, 2012 at 7:17 AM, Nick Cox <[email protected]> wrote:
> This is not "Statlist"!
>
> You should show us your code that you tried to get an explanation of
> what you are getting wrong.
>
> bysort patient (year) : gen flag = sum(year != year[_n-1] &
> inrange(year, 2009, 2012))
> by patient : replace flag = flag[_N]
>
> Nick
>
> On Sat, Dec 1, 2012 at 11:55 AM, Michael Stewart
> <[email protected]> wrote:
>
>> Dear Statlist reader ,
>> I am having trouble converting my values into factor variables and am
>> looking for help. My data looks as follows where "patientid" is pt
>> identification number and "year_elevated" is year in which a
>> particular lab value was elevated
>>
>>
>> patientid year_elevated
>> 111 2009
>> 111 2009
>> 222 2009
>> 222 2011
>> 222 2012
>> 333 2009
>> 333 2012
>> 444 2011
>> 444 2012
>> 555 2009
>> 555 2010
>> 555 2011
>> 555 2012
>>
>> I want to create a factor variable (y )with values 1= ,2 , 3 and 4
>> where for each distinct patientid
>> y=1 if year_elevated has anyone of ( 2009 or 2010 or 2011 or 2012) values
>> y=2 if year_elevated has any two of ( 2009 , 2010 , 2011 , 2012) values
>> y=3 if year_elevated has any three of ( 2009 , 2010 , 2011 , 2012) values
>> y=4 if year_elevated has all four of ( 2009 , 2010 , 2011 , 2012) values
> *
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> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/faqs/resources/statalist-faq/
> * http://www.ats.ucla.edu/stat/stata/
--
Thank you ,
Yours Sincerely,
Mike.
*
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* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/