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Re: st: RE: creating an index variable: number of presentations to hospital by participant


From   Mitch Abdon <mitchaabdon@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: creating an index variable: number of presentations to hospital by participant
Date   Thu, 28 Oct 2010 16:14:58 +0800

You may add the year variable in the -by- prefix. You need to include
the year variable in the -sort- as well. See "help by".

On Thu, Oct 28, 2010 at 3:51 PM, Alison McCarthy <statslearner@live.com> wrote:
> Dear Kieran and statalist
>
> regarding the formula below. Is there a way to also split this up by year of presentation?
> This means you have the number of ordered presentations for each participant calculated seperately for each year.
> Thankyou for your help
> Allison
>
>
> ----------------------------------------
>> Subject: st: RE: creating an index variable: number of presentations to hospital by participant
>> Date: Tue, 14 Sep 2010 10:01:57 +0800
>> From: Kieran.McCaul@uwa.edu.au
>> To: statalist@hsphsun2.harvard.edu
>>
>> ....
>>
>> You'll need some sort of patient ID that identifies individuals.
>> Assuming you have that, then:
>>
>> sort patient_id arrivaldate, stable
>> by patient_id: gen order=_n
>>
>>
>> look at -help sort- for an explanation of the option -stable-.
>>
>> Without this option, sort will randomly order observations with the same
>> patient_id and arrivaldate.
>>
>> Of course, if you have the arrival time as well, you could sort on:
>>
>> sort patient_id arrivaldate arrivaltime, stable
>>
>>
>> -----Original Message-----
>> From: owner-statalist@hsphsun2.harvard.edu
>> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Alison
>> McCarthy
>> Sent: Tuesday, 14 September 2010 9:24 AM
>> To: stata
>> Subject: st: creating an index variable: number of presentations to
>> hospital by participant
>>
>>
>> Dear statalist,
>>
>> I am working with a large data file containing presentations to a
>> hospital emergency department (ED). A number of individuals make more
>> than one presentation, which I have seen via the command 'duplicate'.
>> The organisation of my data is below:
>>
>> ARRIVALDATE repeaters part_ID age DISCHARGEDATE
>> 30-Mar-10 0 70 50 30-Mar-10
>> 30-Mar-10 0 70 50 30-Mar-10
>> 31-Mar-10 0 70 50 31-Mar-10
>> 01-Apr-10 0 70 50 01-Apr-10
>>
>>
>> As can be seen, this person presented twice to the ED on the one day;
>> the second person presenting twice in a two-day period.
>>
>> I wish to create a new variable which tells me the number and order (in
>> terms of date) of presentations for each participant, and would greatly
>> appreciate some guidance.
>>
>> Kind regards
>>
>> *
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>>
>> *
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> *
> *   For searches and help try:
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> *   http://www.ats.ucla.edu/stat/stata/
>



-- 
Best,
Mitch


Arnelyn Abdon
Mobile: +639178034402
http://statadaily.wordpress.com

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