problem using MASS corresp and mca functions
Alexandre Fayolle wrote:
I'm an absolute beginner with R and neophite in data analysis, so please bear with me if I ask stupid question. I'm trying to do a correspondence analysis using R and MASS corresp function, but I get an error message which I'm unable to interpret:
data(weblog)
Try read.table(filename, sep=";", header=TRUE) instead of data(weblog). I guess the file is not read in correctly (?).
library(MASS) corresp(~ url + fromurl, data=weblog)
Error in svd(t(t(x1 * Dr) * Dc)) : error 306 in dsvdc
Works for me, so I think it is the way you read in the data. Have you checked, if the data.frame weblog looks OK in R? [Assuming you are running R-1.1.1 and the latest MASS package]
Similarly, I get another error if I try to use mca:
mca(weblog)
Error in (rep(1, n)) %*% G : non-conformable arguments I'm a bit stuck there, with the impression that I'm missing something fundamental. The data I'm using is a csv file extracted from an web server logfile. The first lines are: visitor;date;url;fromurl;agent 61.133.139.118;05/Nov/2000:04:02:08;/img/main_window.gif;http://www.logilab.org/sshots.html;Teleport 61.133.139.118;05/Nov/2000:04:02:16;/contact.html;http://www.logilab.org/dev.html;Teleport <snip>
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