meteR (version 1.1)

meteSSF: meteSSF

Description

meteSSF calculates the ``spatial structure function'' $\Pi(n)$ (analogous to the ecosystem structure function). From the SSF the spatial abundance distribution can be calculated.

Usage

meteSSF(spp, sppID, abund, row, col, x, y, n0 = sum(abund), A, A0)

Arguments

spp

A vector of species names

sppID

A character giving the name of the desired species (as it appears in `spp')

abund

A vector of abundances

row

A vector of row IDs for each observation

col

A vector of column IDs for each observation

x

A vector of x coordinates for each observation

y

A vector of y coordinates for each observation

n0

Total abundance in area A0

A

The area at which abundances were recorded

A0

Total study area

Value

• An object of class meteSSF with elements [object Object],[object Object],[object Object],[object Object]

Details

Uses either data or state variables to calculate the Spatial Structure Function (SSF). Uses internal code to determine when computation-saving approximations can be safely made

References

Harte, J. 2011. Maximum entropy and ecology: a theory of abundance, distribution, and energetics. Oxford University Press.

See Also

metePi

Examples

data(anbo)
## calculate SSF Pi
pi1 <- meteSSF(anbo$spp, 'crcr', anbo$count, row=anbo$row, col=anbo$column, A=1, A0=16)
pi1