Re: [R] fitting power growth

read the part on power fitting: http://www.itc.nl/~rossiter/teach/R/R_CurveFit.pdf -- View this message in context: http://r.789695.n4.nabble.com/fitting-power-growth-tp4635999p4636158.html Sent from the R help mailing list archive at Nabble.com. __ R

[R] fitting power growth

Dear all I am using the x and y vectors as defined below and want do to a power law regression: y = a x^b using > lm(log(y)~log(x)) gives reasonable values (b=1.23) but is not very popular due to biases of back-transformation from log to non-log values. Using > nls(y~a*x^b,start=list(a=1