growth | R Documentation |
Generic function to predict the pdf (probability density function) of continuous (e.g. size) stage at t+1 given stage at t and a growth object.
growth(size, sizeNext, cov, growthObj)
size |
vector of current sizes. |
sizeNext |
vector of sizes in the next time-step. |
cov |
a data-frame with one row containing all covariates for this time-step. |
growthObj |
a growth object. |
Models defining continuous (size) stage at t+1, or growth increment, or log growth increment are defined; with various underlying statistical models allowing decreasing variance in size, etc.
a vector of length sizeNext giving the pdf (probability density function) of each value of sizeNext.
C. Jessica E. Metcalf, Sean M. McMahon, Roberto Salguero-Gomez, Eelke Jongejans & Cory Merow.
Easterling, Ellner & Dixon. 2000. Size-specific sensitivity: a new structured population model. Ecology 81, p694-708.
surv
, growSurv
dff <- generateData() gr1 <- makeGrowthObj(dff) sizeRange <- c(1:20) sizeInit <- 1 growth(sizeInit, sizeRange, data.frame(cov=1), gr1) plot(growth(sizeInit, sizeRange, data.frame(cov=1), gr1), type="l", col = "dark gray", xlab = "Continuous (e.g. size) stage at time t+1", ylab = paste("Probability of growth to a specific size in t+1 from size ", sizeInit, " at time t"))
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