how to do the parametric trend analysis in R

Question

[zhangdengwei]

Hi all,

I had a dataset containing three groups. Say:

A: 1, 2, 1, 3
B: 2, 4, 5, 3
C: 6, 6, 5, 7

And I would like to do the linear trend analysis, like the following:

And I searched the method online and found there are some R packages like trend to perform non-parametric trend analysis, but no R packages for linear trend analysis.

Any suggestions would be greatly appreciated.

Cheers