I suppose there are a couple of ways...
if (numbers==1) {
distot <-
} else if (numbers ==2) {
distot <-
} else if (numbers==3) {
distot <-
} else distot <- NA
(letting you fill in the right hand side within each block)
There's also
distot <- switch(numbers,
w9zd9_1,
(w9zd9_1 + w9zd9_2)/2,
(w9zd9_1 + w9zd9_2 + w9zd9_3)/3,
NA)
In both cases I added an explicit result in case numbers is not one
of the expected values.
Generalizing this to an arbitrary value of numbers would be trickier.
-Don
At 11:05 AM -0400 9/14/09, Casey Klofstad wrote:
I'm sure this is easy, but I'm having a hard time figuring out how to
recode some data in R.
I have a variable "numpeers" which is valued 1, 2, or 3. I also have
three other variables called "w9zd9_1," "w9zd9_2," and "w9zd9_3." I
want to use these variables to create a new item called "distot."
Specifically, here is what I want to do:
-if numpeers=1, then distot=w9zd9_1
-if numpeers=2, then distot=(w9zd9_1 + w9zd9_2)/2
-if numpeers=3, then distot=(w9zd9_1 + w9zd9_2 + w9zd9_3)/3
Thanks, in advance, for the help!
--
Casey A. Klofstad
University of Miami
Department of Political Science
Coral Gables, FL
klofs...@gmail.com
http://*www.*as.miami.edu/personal/cklofstad/
______________________________________________
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PLEASE do read the posting guide http://*www.*R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
