SSpower3P | R Documentation |
This selfStart model evaluates the power regression function (formula as: y=a*x^b+c). It has an initial attribute that will evaluate initial estimates of the parameters a, b, and c for a given set of data.
SSpower3P(predictor, a, b, c)
predictor |
a numeric vector of values at which to evaluate the model. |
a, b, c |
Three numeric parameters responsing to the exp3P model. |
Weiping Mei meiweipingg@163.com
trendline
, SSexp3P
, SSpower3P
, nls
, selfStart
library(basicTrendline) x<-1:5 y<-c(2,4,8,20,25) xy<-data.frame(x,y) getInitial(y ~ SSpower3P(x,a,b,c), data = xy) ## Initial values are in fact the converged values fitpower3P <- nls(y~SSpower3P(x,a,b,c), data=xy) summary(fitpower3P)
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