calc_fxj: Age-Specific Female Fecundity F_xj

In insectecol: Insect Ecology Data Analysis Toolkit

Age-Specific Female Fecundity F_xj

Description

The mean number of eggs laid per living female at age x. For every female the daily egg counts are aligned to her age at emergence, so that eggs are attributed to the correct age class; the mean is taken over the females still alive at each age.

Usage

calc_fxj(lt, sxj = NULL)

Arguments

lt	A life_table object returned by lifeTable_read.
sxj	Optional; the result of calc_sxj. Supplying it avoids recomputing the age-stage survival rates.

Value

A data frame with the columns Age and F_xj; a terminal row with F_xj = 0 is appended.

See Also

calc_F for the overall mean fecundity, calc_mx for the age-specific fecundity of the cohort.

Examples

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

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