search for: leafbiomass

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$Date[i-1]; de=leafbiom$Da...

...for anything. I would have thought > that you would use leaf biomass as the predictor variable, not Date. > - I'm not sure why you want the cumulative sum of stand height; that > doesn't make sense to me. > > I'm guessing you want: > > height.model <- lm(height ~ leafbiomass, data = Stand_Height) > pred.height <- predict(height.model, leafbiom) > > # not sure about the reasoning behind this > SH <- cumsum(pred.height) > > You don't need a loop. Overwriting SH is the biggest R problem; the > rest of my questions have to do with what your o...

...Leaf biomass data is never used for anything. I would have thought that you would use leaf biomass as the predictor variable, not Date. - I'm not sure why you want the cumulative sum of stand height; that doesn't make sense to me. I'm guessing you want: height.model <- lm(height ~ leafbiomass, data = Stand_Height) pred.height <- predict(height.model, leafbiom) # not sure about the reasoning behind this SH <- cumsum(pred.height) You don't need a loop. Overwriting SH is the biggest R problem; the rest of my questions have to do with what your objective actually is, like what y...

...hought >> that you would use leaf biomass as the predictor variable, not Date. >> - I'm not sure why you want the cumulative sum of stand height; that >> doesn't make sense to me. >> >> I'm guessing you want: >> >> height.model <- lm(height ~ leafbiomass, data = Stand_Height) >> pred.height <- predict(height.model, leafbiom) >> >> # not sure about the reasoning behind this >> SH <- cumsum(pred.height) >> >> You don't need a loop. Overwriting SH is the biggest R problem; the >> rest of my questions...