[R] lm() portion of data

[Duncan Murdoch]

On 11-01-18 12:49 PM, Karen Aanensen wrote:
> Hello,
>
> I have a set of data for which I am making linear model.  I would like to
> restrict this model for a subset of the data.
>
> I have 100 independent variables labeled x1-x100.  I would like to only like
> an lm() that is only accounts for x1-x20.
>
> I have tried restricting my plot:
> plot(Date.Code,cases, xlim=c(x1, x20))
>
> m<-lm(cases~Date.Code)
>
> summary(m)
>
>
> But this only restricts the graphic bounds, not the analysis.
>
> I would greatly appreciate any help on  this matter.

You need to use the subset argument to lm, e.g.

lm(cases ~ Date.Code, subset = (x1 <= Date.Code) & (Date.Code <= x2))


I'd recommend using the data= ... argument to lm() rather than relying 
on finding the variables in the global environment as well.

Duncan Murdoch

>
>
> Thank you for your time and help,
> Karen
>
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>
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