[R] about lm

David Winsemius dwinsemius at comcast.net
Sat Nov 17 18:33:01 CET 2012


On Nov 17, 2012, at 8:56 AM, FJ M wrote:

> attach(attach(dat))
>
> should be
>
> attach(dat)
>
> Is attach() broken? I've been using attach() successfully for  
> months. I was surprised that header=TRUE did not map the headers to  
> the data.

???. 'header=TRUE' changes how read.table() and derivatives handle the  
first line of a input file. You may be expressing surprise that the  
the names of list elements are not in the search path. (Dataframes are  
lists.)


> But since attach() worked, I've never asked for an enhancement to  
> the various read functions.
>
> Thanks,
>
> Frank
>
>
> > CC: soniaamin5 at gmail.com; r-help at r-project.org
> > From: dwinsemius at comcast.net
> > To: chicagobrownblue at hotmail.com
> > Subject: Re: [R] about lm
> > Date: Sat, 17 Nov 2012 08:31:01 -0800
> >
> >
> > On Nov 17, 2012, at 4:29 AM, FJ M wrote:
> >
> > >
> > > dat=read.csv("c:\\ven.csv",header=TRUE,sep=";");
> > > attach(attach(dat))
> >
> > It is generally less error prone to avoid attach (even once).
> > > dat
> > > lm.1<-lm(ve~ su)
> >
> > And instead use:
> >
> > lm.1<-lm(ve~ su, data=dat)
> >
> > > summary(lm.1)
> > >
> > > GL Frank
> > >> Date: Fri, 16 Nov 2012 20:42:39 +0100
> > >> From: soniaamin5 at gmail.com
> > >> To: r-help at r-project.org
> > >> Subject: [R] about lm
> > >>
> > >> Dear friends,
> > >> I have a csv file entitled ven.csv located in C:\\, this file
> > >> contains only
> > >> two columns:"ve" and "su" I have written the following lines:
> > >> data=read.csv("c:\\ven.csv",header=TRUE,sep=";");
> > >>
> > >> lm(ve~ su)
> > >> I have obtained the following message:
> > >>
> > >> Error in eval(expr, envir, enclos) : object 've' does not exist.
> > >> What's the
> > >> problem? thank you for your help in advance
> > >>
> > >> [[alternative HTML version deleted]]
> > >>
> >
> > When you do get around to reading the Posting Guide, please note the
> > section where the request to NOT post in HTML is made.
> >
> > > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> > > and provide commented, minimal, self-contained, reproducible code.
> >
> >
> > --
> > David Winsemius, MD
> > Alameda, CA, USA
> >

David Winsemius, MD
Alameda, CA, USA




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