[R] Predict

[Ahmed Attia]

Hi folks,

I have 25 stand height observations over 7 years period and daily
leafbiomass data during this period. I want to use the 25 plant height
observations as inputs and predict the daily stand height during the 7
years.


SH=matrix(data=NA , nrow = 2641, ncol = 1)
for (i in 1:2641) {
  SH<- predict(lm(height~Date, data=Stand_Height));

  dl=leafbiom$Date[i-1];
  de=leafbiom$Date[i];
SH[i]=sum(SH[leafbiom$Date==de&leafbiom$Date==dl])


}
SH


The SH output is the prediction of Stand height in 25 observations
only and provides NA for the remaining 2616 iterations.

Thanks for your help.



Ahmed Attia, Ph.D.
Agronomist & Soil Scientist