Lifespan: minimum lifespan

In EasyMARK: Utility functions for working with mark-recapture data.

Description

Gives a vector of minimum lifespans for each individual.

Usage

Lifespan(ch)

Arguments

ch	input a matrix or a single-columned data.frame of capture histories. It will return a vector of minimum lifespans for each row

Details

This function computes the mimimum lifespans given a capture history. This is computed as the first day seen subtracted by the last day seen. For example, an individual with the capture history of "1001" would have a minimum lifespan of 3; "1110" = 2; "1010" = 2, "01000001" = 6 etc. See examples.

Value

vector

A numerical vector of lifespans

Author(s)

John Waller

Examples

#' set up variables to be used by Simulate.CH for ten individuals
N = 10 
x1 = rnorm(N) #' each trait is normally distributed

#' Run Simulate.CH with a constant recapture probability
chObj = Simulate.CH(surv.form = 1 + 0.15*x1, p.constant = 1, N = N)

attributes(chObj) #' see what is inside our object
ch_matrix = chObj$ch_split #' grab our matrix from the list
ch_matrix #' lets look at it

ch_df = chObj$ch #' lets grab a data.frame also
ch_df 

#' we can compute the minimum lifespan on either a matrix or a data.frame as input
Lifespan(ch_matrix) #' on a matrix
Lifespan(ch_df) #' on a data.frame

EasyMARK documentation built on May 2, 2019, 2:45 p.m.