negexpo: The negative exponential SAR regression model

In fguilhaumon/mmSAR: mmSAR is an R package for the modelling of the Species-Area Relationship (SAR).

Description

s == c * (1 - exp(-z * a))

Usage

data(negexpo)

Format

The format is: List of 8 $ name : "Negative exponential" $ formula : expression(s == c * (1 - exp(-z * a))) $ paramnumber: 8 $ paramnames : "c" "z" $ parLim : "Rplus" "unif" $ fun : model function $ rssfun : Residual Sum of Squares function $ init : initial values calculation $ form : a formula object for further calculations

Details

The negative exponential model is convex asymptotic. For further details and documentation please see the online documentation at http://mmsar.r-forge.r-project.org/

Source

Holdridge et al. (1971), Miller & Wiegert (1989), Ratkowsky (1990), Tjørve (2003).

References

Holdridge, L.R., Grenke, W.C., Hatheway, W.H., Liang, T. & Tosi, J.A. (1971) Forest environments in tropical life zones. Pergamon Press, Oxford.

Miller, R.I. & Wiegert, R.G. (1989) Documenting completeness, species–area relations, and the species abundance distribution of a regional flora. Ecology, 70, 16–22.

Ratkowsky, D.A. (1990) Handbook of nonlinear regression models. Marcel Dekker, New York.

Tjørve, E. (2003) Shapes and functions of species–area curves: a review of possible models. Journal of Biogeography, 30, 827–835.

Examples

#loading the negexpo model object before using it
data(negexpo)

fguilhaumon/mmSAR documentation built on May 30, 2019, 7:20 p.m.