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.


Thank you for your time and help,
Karen

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