Hi Felipe,

Make sure "predictors" data.frame has the EXACT same column names as the
data.frame you used for creating ModeloLineal.

Cheers,
Tal



----------------Contact
Details:-------------------------------------------------------
Contact me: Tal.Galili@gmail.com |  972-52-7275845
Read me: www.talgalili.com (Hebrew) | www.biostatistics.co.il (Hebrew) |
www.r-statistics.com (English)
----------------------------------------------------------------------------------------------




On Tue, Apr 6, 2010 at 2:14 AM, Luis Felipe Parra <
felipe.parra@quantil.com.co> wrote:

> Hello I am trying to use predict.lm, but I am having trouble getting out of
> sample predictions. I am getting the same output if I use the following
> three commands:
>
> predict(ModeloLineal,predictors[721:768,])
> predict(ModeloLineal,predictors[1:768,])
> predict(ModeloLineal)
>
> where ModeloLineal is the output from ModeloLineal<-lm(dataTS[,6] ~
> predictors[1:720,]), so the first 720 observations of predictors i would
> like to use them to build my model and the other 48 I would like to use
> them
> to have an out of sample forecast, Do you know how can I do this?
>
> Thank you
>
> Felipe Parra
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org 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.
>

	[[alternative HTML version deleted]]

