Hello All,
I am trying to create a column of weights based off of factor levels
from another column. I am using the weights to calculate L scores.
Here is an example where the first column are scores, the second is my
"factor" and the third I want to be a column of weights. I can do
what I want with an ifelse statement (see below), but I am wondering
if anyone knows of a cleaner way to do this?
example <- data.frame(cbind(rnorm(4), rep(1:4, 1), c(0)))
example$X3 <- ifelse(example$X2==1, -3, (
ifelse(example$X2==2, -1, (
ifelse(example$X2==3, 1, (
ifelse(example$X2==4, 3, NA))))))) ## this seems sloppy to me
> example
X1 X2 X3
1 1.75308880 1 -3
2 -0.49273616 2 -1
3 -0.12446648 3 1
4 -0.06417217 4 3
Thanks for your help,
Joshua
--
Joshua Wiley
Senior in Psychology
University of California, Riverside
http://www.joshuawiley.com/
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