Solow1993.eq2: Intermediate level functions to calculate Burgman,...

In sExtinct: Calculates the historic date of extinction given a series of sighting events

Description

A collection of functions requiring, in addition to the normal intermediate level inputs of data, alpha and data.out, a test.year value. The test.year (typically set as the current year) is the date that p values of persistance are calculated up to.

Usage

Burgman(sightingdata, alpha, test.year, data.out)
Solow1993.eq2(sightingdata, alpha, test.year, data.out)
Solow2005.eq7(sightingdata, alpha, test.year, data.out)

Arguments

sightingdata	A data.frame with two columns, the first containing the year at which a sighting has (or as not) occured, the second a column of the number of sightings that have occured in each year. Can be gaps in the data (which are filled in by the function as 0 sightings within that year). Column names are not restricted. Data must be ranked from oldest at the top, to most recent at the bottom, and restricted to a single row per year. See example.data.
alpha	A 1-alpha confidence interval is calculated for a given value of alpha, typically set as 0.05 (i.e. a 95%CI).
test.year	A year which chance of persistance is calculated up until, typically set as the current year (i.e. test whether the species is currently predicted to be extant or extinct).
data.out	A TRUE/FALSE argument where TRUE produces the predicted chance of persistance at each time step (where applicable), and FALSE gives a simple output with the predicted date of extinction only.

Note

This is a work in progress, to submit a new (to this package) sighting based method for inferring prediction please contact the author (details can be found on www.chrisclementsresearch.co.uk)

Author(s)

Christopher Clements

References

Burgman, M. A., Grimson, R. C., and Ferson, S. (1995). Inferring Threat from Scientific Collections. Conservation Biology, 9(4), 923-928. Solow (1993). Inferring extinction from sighting data. Ecology, 74(3), 962-964. Solow (2005). Inferring extinction from a sighting record. Mathematical Biosciences, 195(1), 47-55.

See Also

Solow1993.eq2.fun

Examples

data(example.data)
Burgman(example.data, alpha=0.05, test.year=2012, data.out=FALSE)

sExtinct documentation built on May 30, 2017, 7:23 a.m.