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VGAM (version 1.1-9)

lpossums: Leadbeater's Possums

Description

Abundance of Leadbeater's Possums observed in the field.

Usage

data(lpossums)

Arguments

Format

A data frame with the following variables.

number

Values between 0 and 10 excluding 6.

ofreq

Observed frequency, i.e., the number of sites.

Details

A small data set recording the abundance of Leadbeater's Possums Gymnobelideus leadbeateri observed in the montane ash forests of the Central Highlands of Victoria, in south-eastern Australia. There are 151 3-hectare sites. The data has more 0s than usual relative to the Poisson, as well as exhibiting overdispersion too.

See Also

zipoissonff.

Examples

Run this code
lpossums
(samplemean <- with(lpossums, weighted.mean(number, ofreq)))
with(lpossums,  var(rep(number, times = ofreq)) / samplemean)
sum(with(lpossums, ofreq))
if (FALSE)  spikeplot(with(lpossums, rep(number, times = ofreq)),
  main = "Leadbeater's possums", col = "blue", xlab = "Number") 

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