From: S.O. Nyangoma <S.O.Nyangoma_at_amc.uva.nl>

Date: Wed 10 Aug 2005 - 20:21:33 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Aug 10 20:28:33 2005

Date: Wed 10 Aug 2005 - 20:21:33 EST

I see that

log(y)=log(k1)+k2*log(x)

use lm?

*>
*

> Meta:

*> This question is somewhat long and has two parts, I would be very
**> happyfor someone just to nudge me in the right direction with the
**> manual /
**> tutorial, as I am somewhat lost...
**>
**>
**> 1) How do I fit a curve of the form "y = k1 * x^k2" ?
**>
**> I want to estimate values of k1 and k2 given the x/y data I have,
**> and I
**> can't work out how to get R to calculate and return their estimates.
**>
**>
**> 2) Given the value of k1 and k2 for population A, how can I test if
**> population B has significantly different values of k1 and k2?
**>
**> Sorry for the basic question. I think I just need to read up on a few
**> functions.
**>
**>
**> I have about 50 xy pairs in total if that makes a difference.
**>
**> Dan.
**>
**> ______________________________________________
**> R-help@stat.math.ethz.ch mailing list
**> https://stat.ethz.ch/mailman/listinfo/r-help
**> PLEASE do read the posting guide! http://www.R-project.org/posting-
**> guide.html
*

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Aug 10 20:28:33 2005

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