On Jan 2, 2012, at 4:11 AM, Richard Kolodziej wrote:
Hello,
I'm using SPSS at work but really would like to switch to R. Right
now I'm
trying to learn R in reproducing calculations I did with SPSS but am
stuck
with something that is quite simple and comprehensible in SPSS-Syntax:
IF (variable1.fac = 0 AND variable2.num = 0) variable3=1.
IF (variable1.fac = 0 AND variable2.num >= 1) variable3=2.
IF (variable1.fac = 1 AND variable2.num = 0) variable3=3.
IF (variable1.fac = 1 AND variable2.num >= 1) variable3=4.
I want to create four different groups out of different conditions
of two
variables:
* variable1.fac is a factor coded with 0 and 1
* variable2.num is a numerical variable with only whole numbers
My problem with R is that I can't find a way to use AND in an IF
statement
that doesn't produce an error or not intended solutions.
"An Introduction to R" is really unhelpful with this problem and I
wouldn't
have written here, if I didn't have searched for the answer.
Do you not find the 'ifelse' function described in "An Introduction to
R" in the section regarding "if".
http://tolstoy.newcastle.edu.au/R/help/05/09/12136.html was helpful in
understanding how the IF statement is written in R but didn't answer
my
question how to add an usable AND (&, |)
Not the best answer I have ever seen in the archives. But if you had
followed up by reading further in the thread you would have found the
correct approach.
https://stat.ethz.ch/pipermail/r-help/2008-November/178808.html looked
promising but didn't do what I had intended
(I think the results of interaction( variable1.fac = 0 , variable2.num
= 0) should have dome very nicely, but if you wanted them a naked
numbers then this would have also givne satisfaction:
var3 <- as.numeric( interaction( variable1.fac = 0 , variable2.num =
0) )
--
David
Thanks in advance,
Richard
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
