[R] Problems using "lm" in combination with "predict"

[Gabor Grothendieck]

Here is an example using the builtin Loblolly data frame

> mod <- lm(height ~., Loblolly)
> predict(mod, data.frame(age = 10, Seed = "301"))
[1] 25.47510


On 8/4/07, "Maja Schröter" <maja.schroeter at gmx.de> wrote:
> Hi,
>
> I am sorry
>
>
> I meant:
>
>
>  mod <- lm(y~Worktime+Vacation+Illnes+Bankholidays)
>
>  newdate=data.frame(x=c(324,123,0.9,0.1))
>  predict(mod,newdate)
>
> And get this error.
>
> Yours,
>
> Maja
>
>
>
>
> -------- Original-Nachricht --------
> Datum: Sat, 4 Aug 2007 04:42:14 -0700 (PDT)
> Von: Stephen Tucker <brown_emu at yahoo.com>
> An: "Maja \\"Schröter\\"" <maja.schroeter at gmx.de>, r-help at stat.math.ethz.ch
> Betreff: Re: [R]  Problems using "lm" in combination with "predict"
>
> > I think you need
> >
> > predict(mod,newdate)
> >
> > instead of
> >
> > predict(y,newdate)
> >
> >
> > --- "Maja Schröter" <maja.schroeter at gmx.de> wrote:
> >
> > > Hello everybody,
> > >
> > > I'm trying to predict a linear regression model but it does not work.
> > >
> > > My Model: y = Worktime + Vacation + Illnes + Bankholidays
> > >
> > > My modelmatrix is of dimension  28x4
> > >
> > > Then I want to make use of the function predict because there
> > > confidence.intervals are include.
> > >
> > > My idea was:
> > >
> > > mod <- lm(y~Worktime+Vacation+Illnes+Bankholidays)
> > >
> > > newdate=data.frame(x=c(324,123,0.9,0.1))
> > > predict(y,newdate)
> > >
> > > But I always get the message:
> > >
> > >
> > > 'newdata' had 1 rows but variable(s) found have 28 rows
> > >
> > >
> > > What can I do?
> > >
> > > Yours,
> > >
> > > Maja
> > >
> > > --
> > > Psssst! Schon vom neuen GMX MultiMessenger gehört?
> > > Der kanns mit allen: http://www.gmx.net/de/go/multimessenger
> > >
> > > ______________________________________________
> > > R-help at stat.math.ethz.ch mailing list
> > > 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.
> > >
> >
> >
> >
> >
> > ____________________________________________________________________________________
> > Looking for a deal? Find great prices on flights and hotels with Yahoo!
> > FareChase.
> > http://farechase.yahoo.com/
>
> --
> Psssst! Schon vom neuen GMX MultiMessenger gehört?
> Der kanns mit allen: http://www.gmx.net/de/go/multimessenger
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> 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.
>