I am trying to write a function for P-I curve meansurament of Platt (1980). I used the exemple of nonlinear least squares in R-intro.pdf but I can't finish the analysis. Could you help me? Is there another way to do this analysis?
Thanks.
I<- c(0,0,100,100,200,200,500,500)
P<- c(1.35,-1.41,10.45,9.92,23.99,18.05,9.24,12.31)
ps<-23.99
fn<- function (I) (ps*(1 - exp (-I[1]*I/ps))*(exp (-I[2]*I/ps)))
plot(I,P)
xfit <- seq(0, 500, 100)
yfit <- ?

Msc. Bruno Pereira Masi
Doutorando em Ecologia e Recursos Naturais/UENF
CRBio-02 38.047/02
Instrutor Assistente/PDIC # 11014
Instrutor Marine Life/PDIC # 11014
Endereço CV Lattes:http://lattes.cnpq.br/7389424696175959


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