Hi,
I fitted tree growth data with Chapman-Richards growth function using nls.
summary(fit.nls)
Formula: HEIGHT ~ A * (1 - exp(-B * AGE))^C
Parameters:
Estimate Std. Error t value Pr(>|t|)
A 29.007627 0.270485 107.24 <2e-16 ***
B 0.030813 0.001095 28.13 <2e-16 ***
C 1.849405 0.068659 26.94 <2e-16 ***
---
Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
Residual standard error: 1.879 on 713 degrees of freedom
Algorithm "port", convergence message: relative convergence (4)
When I try to run the anova() function I get this:
anova(fit.nls)
Error in anova.nls(fit.nls) : anova is only defined for sequences of "nls"
objects
Could you tell me what the problem is?
Thanks & Regards,
Guru S
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