Data and Tools

Estimating Taxon-Environment Relationships: Measurement Error

This page describes effects of measurement error on regression models for species-environment relationship.

Estimating Taxon-Environment Relationships: Survey Weighting

This page describes the use of probability weighted data for estimating species-environment relationships.

Computing Inferences: Categorical Tolerance Data

This page describes the use of categorical tolerance data for assessing site conditions.

Computing Inferences: Maximum Likelihood Inferences

This page describes the maximum likelihood approach for inferring environmental conditions.

Basic Analyses

Overview of using classification and regression trees (CART) includes assumptions in CART analysis, and insight on pruning regression trees, .

Using R for Significance Tests

Script for conducting significance tests for models using R.

Using R for Non-Parametric Regression

Script for computing nonparametric regression analysis. Overview of using scripts to infer environmental conditions from biological observations, statistically estimating species-environment relationships, statistical scripts.

Using R for Parametric Regression

Script for computing single variable parametric regressions for presence/absence of different taxa.

Estimating Taxon-Environment Relationships: Environmental Limits

This page describes cumulative distribution approach to estimating optima in terms of environmental limits.

Loading Data into R

Scripts for loading data into R.

Using Taxon-Environment Relationships: Assign Operational Taxonomic Units

Step instructions for assigning operational taxonomic units.

Computing Inferences: Weighted Average Inferences

This page describes a weighted average approach for inferring environmental conditions.

Estimating Taxon-Environment Relationships: Parametric Regressions

This page describes the parametric regression approach to estimating species-environment relationship.

Using Taxon-Environment Relationships: Compute Biological Inferences

Step instructions for computing inferred environmental conditions.

SSD Plots

Species sensitivity distributions, cadmium, LC50, ECOTOX, arthropod

R Script: Non-Parametric Regression

How to Fit Non-Parametric Curves to Observations

Estimating Taxon-Environment Relationships: Assessing Model Fit

This page describes several approaches for assessing model fit for species-environment models.

R Script: Compute Area Under ROC Curve

How to compute the area under the ROC curve in data analysis.

Basic Analyses

Overview of linear regression analysis and questions to consider when using this type of data analysis.

CADStat Installation Instructions

CADStat is a statistical program designed to assist risk assessors with data analysis.