Comparing points on the same regression line
An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-sig-teaching/attachments/20090511/36d4f9a1/attachment.pl>
An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-sig-teaching/attachments/20090511/36d4f9a1/attachment.pl>