[R] Beginner question: select cases
Peter Wolkerstorfer - CURE
wolkerstorfer at cure.at
Mon Sep 25 13:51:11 CEST 2006
Hello all,
I hope i chose the right list as my question is a beginner-question.
I have a data set with 3 colums "London", "Rome" and "Vienna" - the
location is presented through a 1 like this:
London Rome Vienna q1
0 0 1 4
0 1 0 2
1 0 0 3
....
....
....
I just want to calculate the means of a variable q1.
I tried following script:
# calculate the mean of all locations
results <- subset(results, subset== 1 )
mean(results$q1)
# calculate the mean of London
results <- subset(results, subset== 1 , select=c(London))
mean(results$q1)
# calculate the mean of Rome
results <- subset(results, subset== 1 , select=c(Rome))
mean(results$q1)
# calcualate the mean of Vienna
results <- subset(results, subset== 1 , select=c(Vienna))
mean(results$q1)
As all results are 1.68 and there is defenitely a difference in the
three locations I wonder whats going on.
I get confused as the Rcmdr asks me to overwrite things and there is no
"just filter" option.
Any help would be apprechiated. Thank you in advance.
Regards
Peter
___CURE - Center for Usability Research & Engineering___
Peter Wolkerstorfer
Usability Engineer
Hauffgasse 3-5, 1110 Wien, Austria
[Tel] +43.1.743 54 51.46
[Fax] +43.1.743 54 51.30
[Mail] wolkerstorfer at cure.at
[Web] http://www.cure.at
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