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st: RE: Testing for a particular value and replacing in last observation?


From   "Kieran McCaul" <Kieran.McCaul@uwa.edu.au>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Testing for a particular value and replacing in last observation?
Date   Sat, 12 Sep 2009 05:47:14 +0800

...

Is this what you mean?

clear

set obs 10

gen x = uniform()*10

set obs `=_N+1'

summ x, meanonly
local max = r(max)
replace x=1 if `max'<2 in l 
replace x=2 if `max'>=2 & `max'<5 in l
replace x=3 if `max'>=5 & `max'<. in l 





______________________________________________
Kieran McCaul MPH PhD
WA Centre for Health & Ageing (M573)
University of Western Australia
Level 6, Ainslie House
48 Murray St
Perth 6000
Phone: (08) 9224-2701
Fax: (08) 9224 8009
email: Kieran.McCaul@uwa.edu.au
http://myprofile.cos.com/mccaul 
http://www.researcherid.com/rid/B-8751-2008
______________________________________________
If you live to be one hundred, you've got it made.
Very few people die past that age - George Burns

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Christian Weiß
Sent: Saturday, 12 September 2009 2:33 AM
To: statalist
Subject: st: Testing for a particular value and replacing in last observation?

Dear Statalist,

assume there is one variable x with 10 observations filled with
random numbers between 0 and 10.
the 11th observation should carry the value 1 if ANY observation of x
is <2, 2 if any observation is between 2 and 5, and 3 if any
observation is bigger than 5.

I tried the following:

local obs = 10
local count = 0

while `count' <= `obs' {

     replace x = 1 if x < 2 in `count'
     replace x = 2 if ....and so so on

}

apparently,  this does not work as intended, as this loop does not
place the values 1, 2, 3 in the last observation but in the
observation `count'
I actually need an additional "in"
replace x = 1 in L if x < 2 in `count'

Unfortunately, stata does not allow for this systanx

Do you have any hint for a workaround?

Best,
 Christian
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