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st: RE: Re: replacing values in a variable with rowsums, aka "ereplace"


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Re: replacing values in a variable with rowsums, aka "ereplace"
Date   Tue, 15 Jul 2008 12:08:54 +0100

Note that this won't work as code like 

if y = `n'

needs to be 

if y == `n' 

and 

forvalue n = 1/n {

won't work either. Kim did say "something like". 

Beyond that, I don't see what point Kim is making here. This code can be
collapsed to 

egen x = rowtotal(d1-d40) 

Why create separate variables and put them together when you can get
there in one? 

Nick 
n.j.cox@durham.ac.uk 

Kim Lyngby Mikkelsen (KLM)

If you have consecutive values, you should try to use -forvalue-,
otherwise you could try to use -foreach-.

If you have y=1, y=2, ..., y=n, you could try to do something like this

forvalue n = 1/n {
egen x_`n'=rowtotal (d1-d40) if y=`n'
}
gen x=.
forvalue n = 1/n {
replace x=x_`n' if y=`n'
drop x_`n'
}

Ora John Reuter

I am searching for something that would do the equivalent of an
'ereplace'.  I have a set variables for which I generated a -rowtotal-
given some condition, e.g. (egen x=rowtotal (d1-d40) if y=1), but then
I need to replace some values in that same variable (x) with a
different -rowtotal- given a different condition.  I dont know how else
to explain it except to say that if there were an  'ereplace' command
the next command would look like this:

"ereplace" x=rowtotal(d2-d40) if y=2

In other words, I need to replace values in x with different sums of
variables.  I need to do this for a great many conditions so typing out
the list of variables to be added for each condition would be a minor
pain.



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