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Re: st: Observation variable transformation


From   "Svend Juul" <[email protected]>
To   <[email protected]>
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:       [email protected]
_________________________________________________________

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