Hi Tessa, I agree with John. I think you've made a typo, but looking at your data I think the zero concentration should not be there. Try plotting it.
conc = c(10, 20, 30, 40, 50) signal = c (4, 22, 44, 60, 82) plot(signal~conc) abline(lm(signal~conc)) 2012/11/9 John Kane <jrkrid...@inbox.com> > Tessa, > > Would you please leave in the context --that is your early remarks and > mine? > > Most of us on the R-help list do no use nabble and it is really annoying > to have to go there to see what was discussed. I suspect that a lot of > readers just don't bother and nabble users lose a lot of possible help that > way. > > In any case, I think your problem is a typo in the document. > > My first suggestion gives exactly the same results shown in the > document you supplied. Run this : > conc = c(0, 10, 20, 30, 40, 50) > signal = c (4, 22, 44, 60, 82, NA) > lm.r <- lm( signal ~ conc) > summary(lm.r) > > I hope this helps. > John Kane > Kingston ON Canada > > > > -----Original Message----- > > From: tesara...@gmail.com > > Sent: Fri, 9 Nov 2012 09:36:23 -0800 (PST) > > To: r-help@r-project.org > > Subject: Re: [R] lm function - strange error > > > > Here is the document > > > > > http://www.montefiore.ulg.ac.be/~kvansteen/GBIO0009-1/ac20092010/Class8/Using%20R%20for%20linear%20regression.pdf > > > > ____________________________________________________________ > GET FREE SMILEYS FOR YOUR IM & EMAIL - Learn more at > http://www.inbox.com/smileys > Works with AIM®, MSN® Messenger, Yahoo!® Messenger, ICQ®, Google Talk and > most webmails > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]]
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