petitr {petitr}

Per capita growth rate from individual data

Description

calculates the per capita growth rate of a series of individuals through the set of individual life tables

Usage

petitr(tabvie, niter = 100, eps = 1e-07, m = 1, alpha = 0.05, s = 1)

Arguments

tabvie

A data.frame with a first column recording the endpoint of age classes, and as many columns as individuals. For each individual, each row represents the number of offspring produced by the individual vetween age x-1 and age x. After death or after the end of reproductive life, each column must be filled by zeros . The last row represents therefore the maximum reproductive age observed in the data set. The number of columns is n+1, where n is the number of individuals.

niter

the maximum number of iterations for the Newton's method. Default is 100

eps

Precision required for the Newton's method. Default is 1e-07.

m

Size of the subsamples to drop one after one in the Jackknife method. Default is m=1. Any other value must divide exactly n,the number of individuals.

alpha

First kind error risk. Default is alpha=0.05.

s

ex ratio expressed as the proportion of females in the total population. Default is 1, meaning a parthenogenetic population (ex. aphids). For a sexual population one would often set s=0.5.

Details

Calls r, and xlxmx, called by ranova.

Value

a vector with the pseudovalues of r calculated by the jackknife method

Author(s)

Jean-Sebastien Pierre [e-mail]

References

Birch, L. C. 1948. The intrinsic rate of natural increase of an insect population. - Journal of Animal Ecology 17: 15-26. Lotka, A. (1924). Elements of mathematical biology. Reprinted 1956 by Dover Publications Inc., New York, USA.

See Also

r, and xlxmx, called by ranova

Examples

data(life)
petitr(life)