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

Re: st: Observation variable transformation


From   "Svend Juul" <SJ@SOCI.AU.DK>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Observation variable transformation
Date   Sat, 10 Sep 2005 20:07:19 +0200

Kelly wrote:

I have created an observation variable X (e.g. gen X=_n) for a large data set. How can I create a new variable that is unique for successive observations of 10 variables (i.e. i want this variable to be equal to 1 in obs 1-10, 2 in 11-20, and so forth)?
----

Try this:
    clear
    set obs 50
    gen X=_n
    gen X1 = int((X+9.5)/10)
    list

I added 9.5, not 9, to prevent rounding errors.

Hope this helps.

Svend



________________________________________________________

Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6
DK-8000 Aarhus C,  Denmark
Phone, work:  +45 8942 6090
Phone, home:  +45 8693 7796
Fax:          +45 8613 1580
E-mail:       sj@soci.au.dk
_________________________________________________________

*
*   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