Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

Re: st: repeated values of a variable


From   Richard Williams <Richard.A.Williams.5@nd.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: repeated values of a variable
Date   Tue, 16 Mar 2004 21:33:38 -0500

At 09:15 PM 3/16/2004 -0500, Richard Williams wrote:
At 08:59 PM 3/16/2004 -0500, Judet Roqueta wrote:
Is there a way to have Stata identify observations that have equivalent
values for a given variable?  Speficically, I want to trim my dataset to
individuals that live in the same household using a household id
variable.  I want to get rid of those that live alone.  I tried using
the egen tag and egen group commands, but that did not help.
Is this what you want?

. egen x = count(id), by(id)

. drop if x==1
To follow up -- if id is missing, x gets coded 0. So, if you have missing data on the id variable, and you also want such cases dropped, a better coding would be

. egen x = count(id), by(id)

. keep if x > 1



-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
FAX: (574)288-4373
HOME: (574)289-5227
EMAIL: Richard.A.Williams.5@ND.Edu
WWW (personal): http://www.nd.edu/~rwilliam
WWW (department): http://www.nd.edu/~soc

*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/




© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index