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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