SPPREV

This data set is summary prevalence for Presence/Absence data for 13 species from 1930 forested locations. <code>SPPREV</code> is the prevalence data from the full dataset (training and test data). Note that <code>SPDATA</code> is the model predictions from the test data subset (20 percent of total plots) of this original dataset, and therefore the species in <code>SPDATA</code> have slightly different prevalence than the overall prevalence given in <code>SPPREV</code>.

datasets

This package provides a set of functions useful when
evaluating the results of presence-absence models. Package
includes functions for calculating threshold dependent measures
such as confusion matrices, pcc, sensitivity, specificity, and
Kappa, and produces plots of each measure as the threshold is
varied. It will calculate optimal threshold choice according to
a choice of optimization criteria. It also includes functions
to plot the threshold independent ROC curves along with the
associated AUC (area under the curve).

Elizabeth Freeman

PresenceAbsence

Presence-Absence Model Evaluation.

SPPREV function

A data frame with data for 13 species. Dataframe consists of species names, number of plots where the species was present, and the overall prevalence for each species:<dl class="dl-horizontal">
 <dt><code>SPECIES</code></dt><dd>a character vector of species codes</dd>
 <dt><code>NUMPLOTS</code></dt><dd>a numeric vector of plot counts</dd>
 <dt><code>PREV</code></dt><dd>a numeric vector of prevalence</dd>
 </dl>

Format

Overall Preavalences for Species Presence/Absence Data — SPPREV

A data frame with data for 13 species. Dataframe consists of species names, number of plots where the species was present, and the overall prevalence for each species:<dl class='dl-horizontal'>
 <dt><code>SPECIES</code></dt><dd>a character vector of species codes</dd>
 <dt><code>NUMPLOTS</code></dt><dd>a numeric vector of plot counts</dd>
 <dt><code>PREV</code></dt><dd>a numeric vector of prevalence</dd>
 </dl>

SPPREV: Overall Preavalences for Species Presence/Absence Data

Description

Usage

Arguments

Format

Examples