Hi, all,

I am thinking to compare a group of slopes from regression lines to see if
they are different overall, and then make specific comparisons between
groups. How can I achieve that in R?  I searched the archives and there are
only discussions about comparing two lines a time.  Thanks.

A sample data set is like the following. I would like to compare the
regression slopes between the five groups. Thanks for your help.

data<-data.frame(x=rep(1:10,5),y=rnorm(50),group=rep(1:5,each=10))

Jun Shen

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