[R] Problem with col

[Sonia Amin]

Thank you very much John I understand the problem.

2015-04-20 19:38 GMT+02:00 John Kane <jrkrideau at inbox.com>:

>
>
>
> > -----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
> >>
> >
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> >
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