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va_start
2017 Jul 25
0
Using nls.lm to fit a non-continuous dates range
...in nls(...)
par <- nls.out$par
nls.final <- nls(Y~a+b*log(tc-days),data=df,
start=c(a=par$a, b=par$b, tc=par$tc))
summary(nls.final) # display statistics of the fit
# append fitted values to df
df$pred <- predict(nls.final)
Also attempting to fit a selfstart model
a_start<-8
b_start<-2*log(2)/a_start
m<-nls(df$Y~a*exp(-b*df$days),start=list(a=a_start,b=b_start))
Error in nls(df$Y ~ a * exp(-b * df$days), start = list(a = a_start, b
= b_start)) :
parameters without starting value in 'data': Y, days
Could you please help
Thank you
Ahmed Attia, Ph...