While following the suggestion in the manual "An Introduction to R" to
begin with Appendix A, I ran into the problem shown below about 3/4 of
the way down the 1st page of App. A.
After using the function /attach/, I did not get visible columns in the
data frame as indicated but the rather puzzling message emphasized below.
I am running R version 3.1.0 (2014-04-10) using Windows XP. Thanks in
advance for your help.
> > x<-1:20
> > w<-1+sqrt(x)/2
> > dummy<-data.frame(x=x, y=x+rnorm(x)*w)
> > dummy
> x y
> 1 1 2.885347
> ...
> > fm<- lm(y ~ x, data=dummy)
> > summary(fm)
>
> Call:
> ...
> > fm1<- lm(y ~ x, data=dummy,weight=1/w^2)
> > summary(fm1)
>
> Call:
> ...
> > attach(dummy)
> *_The following object is masked _by_ .GlobalEnv:
>
> x_**_
> _*
--
/Stephen A Meskin/, PhD, FSA, MAAA
Adjunct Assistant Professor of Mathematics, UMBC
**//
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