Problem with col
-----Original Message----- From: soniaamin5 at gmail.com Sent: Mon, 20 Apr 2015 18:56:19 +0200 To: sarah.goslee at gmail.com Subject: Re: [R] Problem with col
--- clip--
When I type data , I obtain all the numeric values and the headears I added (Consommation,Cylindre,Puissance,Poids)
No you probably do not, as Sarah explained.
As a quick example of the issue look at the two data sets below. Just copy and paste into your R editor. Both data sets are in dput() format which is how you should supply sample data to R-help.
ddat1 <- structure(list(aa = structure(1:4, .Label = c("a", "b", "c",
"d"), class = "factor"), bb = 1:4), .Names = c("aa", "bb"), row.names = c(NA,
-4L), class = "data.frame")
ddat2 <- structure(list(aa = c("a", "b", "c", "d"), bb = c("1", "2", "3", "4")), .Names = c("aa", "bb"), row.names = c(NA, -4L), class = "data.frame")
If yo do
dat1
dat2
they look the same on the screen but if you do str() they are not the same.
str(dat1)
str(dat2)
Also try
ddat1$bb * 5 #works
ddat2$bb * 5 # error!
They look the same on the computer screen but they are quite different.
John Kane
Kingston ON Canada
Thanks 2015-04-20 18:40 GMT+02:00 Sarah Goslee <sarah.goslee at gmail.com>:
What is the problem? One or more of your columns was read as factor, as str(data) would show you. To avoid this, you can add stringsAsFactors=FALSE to the read.table command, but if you expect your data to be entirely numeric then there's something wrong with it that you need to hunt down. Sarah On Mon, Apr 20, 2015 at 12:33 PM, Sonia Amin <soniaamin5 at gmail.com> wrote:
Dear All, I have written the following lines:
data<-read.table("C:\\Users\\intel\\Documents\\SIIID\\datamultiplereg.txt",header
= FALSE, sep = "")
colnames(data)<-c("Consommation","Cylindre","Puissance","Poids")
result.model1<-lm(Consommation~Cylindre+Puissance+Poids, data=data)
summary(result.model1)
I obtained the following message:
Call:
lm(formula = Consommation ~ Cylindre + Puissance + Poids, data = data)
Residuals:
Error in quantile.default(resid) : factors are not allowed
In addition: warning message:
In Ops.factor(r, 2) :
?^? This is not relevant for factors
Where is the problem?
Thank you in advance
-- Sarah Goslee http://www.functionaldiversity.org
[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
____________________________________________________________ Can't remember your password? Do you need a strong and secure password? Use Password manager! It stores your passwords & protects your account.