calc_R0: Net Reproductive Rate R0

In insectecol: Insect Ecology Data Analysis Toolkit

Net Reproductive Rate R0

Description

The net reproductive rate: the expected number of eggs produced by an average individual of the cohort over its whole life, R0 = sum over x of s_x,Female * F_xj. A population with R0 = 1 exactly replaces itself; R0 > 1 indicates growth and R0 < 1 decline.

Usage

calc_R0(lt, sxj = NULL, fxj = NULL)

Arguments

lt	A life_table object returned by lifeTable_read.
sxj	Optional; the result of calc_sxj.
fxj	Optional; the result of calc_fxj. Supplying them avoids recomputing.

Value

A single numeric value: the net reproductive rate R0.

References

Goodman, D. (1982) Optimal life histories, optimal notation, and the value of reproductive value. The American Naturalist 119(6), 803-823.

See Also

calc_T, lifeTable_calculate_all

Examples

f <- system.file("extdata", "lifetable_example.csv", package = "insectecol")
lt <- lifeTable_read(f)
calc_R0(lt)

insectecol documentation built on Oct. 5, 2026, 5:08 p.m.