flexhaz: Dynamic Failure Rate Distributions for Survival Analysis

Flexible framework for specifying survival distributions through their hazard (failure rate) functions. Define arbitrary time-varying hazard functions to model complex failure patterns including bathtub curves, proportional hazards with covariates, and other non-standard hazard behaviors. Provides automatic computation of survival, CDF, PDF, quantiles, and sampling. Implements the likelihood model interface for maximum likelihood estimation with right-censored and left-censored survival data.

Version: 0.5.0
Depends: R (≥ 3.5.0)
Imports: stats, numDeriv, algebraic.dist, likelihood.model, generics
Suggests: knitr, rmarkdown, testthat (≥ 3.0.0)
Published: 2026-03-02
DOI: 10.32614/CRAN.package.flexhaz (may not be active yet)
Author: Alexander Towell ORCID iD [aut, cre]
Maintainer: Alexander Towell <queelius at gmail.com>
BugReports: https://github.com/queelius/flexhaz/issues
License: GPL (≥ 3)
URL: https://github.com/queelius/flexhaz, https://queelius.github.io/flexhaz/
NeedsCompilation: no
Materials: README, NEWS
CRAN checks: flexhaz results

Documentation:

Reference manual: flexhaz.html , flexhaz.pdf
Vignettes: Custom Derivatives for Maximum Likelihood Estimation (source, R code)
Creating Custom Distributions (source, R code)
Dynamic Failure Rate Distributions (source, R code)
flexhaz: Hazard-First Survival Modeling (source, R code)
Reliability Engineering Applications (source, R code)

Downloads:

Package source: flexhaz_0.5.0.tar.gz
Windows binaries: r-devel: not available, r-release: not available, r-oldrel: not available
macOS binaries: r-release (arm64): not available, r-oldrel (arm64): not available, r-release (x86_64): not available, r-oldrel (x86_64): not available

Linking:

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