[R] Best fitted curve

[cslc2]

Hi I have trouble making a best fitted curve for a xy-plot. My data consist
of two groups with four repititions for each x-value.

plot(weight~gdd,data=weight,pch=as.numeric(species))
<http://r.789695.n4.nabble.com/file/n4647692/Weight.jpeg>   

Can you help?

Cecilie



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