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 log-normal log-normal mixture. Multiple distributions can be averaged using Akaike Information Criteria. Confidence intervals on hazard concentrations and proportions are produced by bootstrapping.
| Version: | 2.4.0 | 
| Depends: | R (≥ 4.1) | 
| Imports: | abind, chk, furrr, generics, ggplot2, ggtext, glue, goftest, graphics, grid, lifecycle, parallel, plyr, purrr, Rcpp, rlang, scales, ssddata, stats, stringr, tibble, TMB, universals, utils | 
| LinkingTo: | Rcpp, RcppEigen, TMB | 
| Suggests: | actuar, covr, dplyr, EnvStats, extraDistr, fitdistrplus, grDevices, knitr, latex2exp, magrittr, mle.tools, patchwork, readr, reshape2, rmarkdown, testthat (≥ 3.0.0), tidyr, tidyselect, tinytex, VGAM, withr | 
| Published: | 2025-09-12 | 
| DOI: | 10.32614/CRAN.package.ssdtools | 
| Author: | Joe Thorley | 
| Maintainer: | Joe Thorley <joe at poissonconsulting.ca> | 
| BugReports: | https://github.com/bcgov/ssdtools/issues | 
| License: | Apache License (== 2.0) | file LICENSE | 
| URL: | https://github.com/bcgov/ssdtools, https://bcgov.github.io/ssdtools/ | 
| NeedsCompilation: | yes | 
| Language: | en-US | 
| Citation: | ssdtools citation info | 
| Materials: | README, NEWS | 
| CRAN checks: | ssdtools results | 
| Reference manual: | ssdtools.html , ssdtools.pdf | 
| Vignettes: | Frequently Asked Questions (source, R code) Getting Started with ssdtools (source, R code) | 
| Package source: | ssdtools_2.4.0.tar.gz | 
| Windows binaries: | r-devel: ssdtools_2.4.0.zip, r-release: ssdtools_2.4.0.zip, r-oldrel: ssdtools_2.4.0.zip | 
| macOS binaries: | r-release (arm64): ssdtools_2.4.0.tgz, r-oldrel (arm64): ssdtools_2.4.0.tgz, r-release (x86_64): ssdtools_2.4.0.tgz, r-oldrel (x86_64): ssdtools_2.4.0.tgz | 
| Old sources: | ssdtools archive | 
| Reverse imports: | GenHMM1d | 
| Reverse suggests: | serocalculator | 
Please use the canonical form https://CRAN.R-project.org/package=ssdtools to link to this page.