ToxTools is a complete solution for modeling and testing data from dose-response studies, and for estimating Benchmark Dose Levels (BMD’s). The package provides modern, sophisticated modeling and estimation algorithms for fitting dose response data as part of a state-of-the-art suite of graphical and numeric analysis tools for toxicological risk assessment.
With ToxTools, you can choose from a variety of standard dose response model forms for binary and continuous responses. Unique to ToxTools are models for multivariate arrays of mixed discrete/continuous end-points, as well as the ability to accommodate correlated data such as that arising in studies of litters or clusters.
Quantitative risk estimation based on the popular Benchmark Dose methodology is easily achieved from any of the available dose response models, including recent methodological advances for defining risk from multiple outcomes. In addition to classical procedures for conducting group comparisons and tests of trend, the software incorporates new methodology for exact trend tests that apply in cases where sample sizes are small.
ToxTools incorporates these features in an intuitive, friendly Windows environment that was specifically designed for flexibility and "what if" calculations. It is very easy to conduct multiple analyses at both the modeling and risk estimation stages in order to compare/contrast results. And like all of Cytel’s products, the package attains the highest quality of commercial standards for reliability, documentation and customer support.
Comparison of ToxTools and BMDS
Feature ToxTools BMDS
Handles both individual and grouped data * Yes No
Sophisticated, modern interface to define & fit model Yes No
Easy to plot data Yes No
Integrated environment for text and graphic output Yes No
Developmental Tox. Model for Clustered Data Yes No
Provides GEE Models Yes No
Easy to rerun same data with new model Yes No
Easy back and forth between model and BMD calculation Yes No
Tabulation of BMDs for "what if" analysis Yes No
Parameter tables give Z and P-values for all models Yes No
Includes descriptive statistics Yes No
Capable of dynamic plots Yes No
Shows exact BMDL curve Yes No
*Handles individual data only for continuous data.
Who needs ToxTools?
If your work involves testing the safety of chemical or environmental agents, assessing the efficacy of pharmaceutical agents, analyzing and fitting curves to dose-response data, or computing benchmark doses, then you need ToxTools.
Who Developed ToxTools?
ToxTools was developed as a joint effort by scientists at Harvard University, the Dana-Farber Cancer Institute, and Cytel Inc., with funding support from the National Cancer Institute. Leadership for this project was provided by Professors Louise Ryan and Paul Catalano, who are part of the Environmental Statistics Program at the Harvard School of Public Health.