Bookmark and Share

Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: RE: identifying observations where multiple conditions are met


From   Michael McCulloch <[email protected]>
To   [email protected]
Subject   Re: st: RE: identifying observations where multiple conditions are met
Date   Wed, 13 Nov 2013 13:08:31 -0800

Thanks Sergiy for the simulation & code.

I note that the command 
	. tabulate id if flag
will identify both the problem observations I want to drop (where for the same -id-, that -type- is not unique, there are observations of both kinds, type==0 and type==1), but also also ones in which for -id-, that -type- is in fact unique, but there is only ONE observation. 


Best wishes,
Michael McCulloch

--
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 Nov 13, 2013, at 12:38 PM, Sergiy Radyakin wrote:

> //------------------------------------------
> clear
> set obs 100
> gen id=floor(_n/2)
> gen type=floor(uniform()*2)
> //------------------------------------------
> sort id
> by id: egen flag=sd(type)
> replace flag=1 if flag!=0
> 
> Best, Sergiy Radyakin
> 
> 
> On Wed, Nov 13, 2013 at 3:24 PM, Allred, Elizabeth
> <[email protected]> wrote:
>> Have you tried:
>> 
>> tab id if type==0 | type==1
>> 
>> -----Original Message-----
>> From: [email protected] [mailto:[email protected]] On Behalf Of Michael McCulloch
>> Sent: Wednesday, November 13, 2013 3:14 PM
>> To: [email protected]
>> Subject: st: identifying observations where multiple conditions are met
>> 
>> Hello,
>> I have data of the structure:
>>        id              (range 1 to 300)
>>        type    (for each -id-, should equal only one of two values: 0 or 1).
>> 
>> In manual inspection of the data, I see instances exist where, for the same -id-,
>>        some records have type==0, and
>>        other records have type==1.
>> 
>> If I enter
>>        . tab id if type==0 & type==1
>> obviously "no observations" is returned.
>> 
>> How would I write a command in which I can tabulate all -id- for which some observations exist where type==0, and others where type==1? (At data entry, -type- should have unique for each -id-.)
>> 
>> 
>> Best wishes,
>> Michael McCulloch
>> 
>> --
>> 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
>> 
>> 
>> *
>> *   For searches and help try:
>> *   http://www.stata.com/help.cgi?search
>> *   http://www.stata.com/support/faqs/resources/statalist-faq/
>> *   http://www.ats.ucla.edu/stat/stata/
>> 
>> *
>> *   For searches and help try:
>> *   http://www.stata.com/help.cgi?search
>> *   http://www.stata.com/support/faqs/resources/statalist-faq/
>> *   http://www.ats.ucla.edu/stat/stata/
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/faqs/resources/statalist-faq/
> *   http://www.ats.ucla.edu/stat/stata/


*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index