ssdtools: Species Sensitivity Distributions

Species sensitivity distributions are cumulative probability distributions which are fitted to toxicity concentrations for different species as described by Posthuma et al.(2001) <isbn:9781566705783>. The ssdtools package uses Maximum Likelihood to fit distributions such as the gamma, log-logistic, log-normal and Weibull to censored and/or weighted data. Multiple distributions can be averaged using Akaike Information Criteria. Confidence intervals on hazard concentrations and proportions are produced by parametric bootstrapping.

Version: 1.0.6
Depends: R (≥ 4.1)
Imports: abind, chk, doFuture, foreach, furrr, generics, ggplot2, goftest, graphics, grid, lifecycle, parallel, plyr, purrr, Rcpp, scales, ssddata, stats, stringr, tibble, TMB, universals, utils, VGAM
LinkingTo: Rcpp, RcppEigen, TMB
Suggests: covr, dplyr, fitdistrplus, future, glue, grDevices, knitr, magrittr,, R.rsp, readr, reshape2, rlang, rmarkdown, testthat, tidyr, tidyselect, withr
Published: 2023-09-07
DOI: 10.32614/CRAN.package.ssdtools
Author: Joe Thorley ORCID iD [aut, cre, ctr], Carl Schwarz [aut, ctr], Rebecca Fisher [ctb], David Fox [ctb], Angeline Tillmanns [ctb], Ali Azizishirazi [ctb], Kathleen McTavish [ctb], Heather Thompson [ctb], Doug Spry [ctb], Rick van Dam [ctb], Graham Batley [ctb], Heather Thompson [ctb], Andy Teucher [ctb], Seb Dalgarno ORCID iD [ctb], Emilie Doussantousse [ctb], Stephanie Hazlitt [ctb], Nadine Hussein [ctb], Nan-Hung Hsieh [ctb], Sergio Ibarra Espinosa [ctb], Province of British Columbia [cph], Environment and Climate Change Canada [cph]
Maintainer: Joe Thorley <joe at>
License: Apache License (== 2.0) | file LICENSE
NeedsCompilation: yes
Language: en-US
Citation: ssdtools citation info
Materials: README NEWS
CRAN checks: ssdtools results


Reference manual: ssdtools.pdf
Vignettes: Selecting Distributions
Embellishing Plots with an Exposure Distribution
Frequently Asked Questions
Small sample bias in estimates - reference
Get Started with ssdtools
Small sample bias in estimates


Package source: ssdtools_1.0.6.tar.gz
Windows binaries: r-devel:, r-release:, r-oldrel:
macOS binaries: r-release (arm64): ssdtools_1.0.6.tgz, r-oldrel (arm64): ssdtools_1.0.6.tgz, r-release (x86_64): ssdtools_1.0.6.tgz, r-oldrel (x86_64): ssdtools_1.0.6.tgz
Old sources: ssdtools archive


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