Re: [R] Fwd: Help scoring a matrix of item responses

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Tue 14 Feb 2006 - 05:53:56 EST

Assuming this test data:

iris2 <- round(iris[1:10, 1:4])

Try this:

t(t(iris2) == c(iris2[1,])) + 0

On 2/13/06, Rick DeShon <deshon@msu.edu> wrote:
> Hi All.
>
> I'm new to R and trying to learn the data manipulation routines. At the
> moment, this is the one that has me stumped.
>
> Imagine n test takers provide responses to k multiple choice items. The
> result is a (n+1) x k matrix of responses where the first row of the matrix
> is a correct answer key.
>
> How could you transform the raw item responses into 1s (correct response)
> and 0s (incorrect responses) by comparing each test takers response to the
> correct answer key?
>
> Any direction would be appreciated!
>
> Rick
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
>



R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Feb 14 06:01:15 2006

This archive was generated by hypermail 2.1.8 : Wed 15 Feb 2006 - 13:30:05 EST