flexsurv : A Platform for Parametric Survival Modeling in R
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flexsurv is an R package for fully-parametric modeling of survival data. Any parametric time-to-event distribution may be fitted if the user supplies a probability density or hazard function, and ideally also their cumulative versions. Standard survival distributions are built in, including the three and four-parameter generalized gamma and F distributions. Any parameter of any distribution can be modeled as a linear or log-linear function of covariates. The package also includes the spline model of Royston and Parmar (2002), in which both baseline survival and covariate effects can be arbitrarily flexible parametric functions of time. The main model-fitting function, flexsurvreg, uses the familiar syntax of survreg from the standard survival package (Therneau 2016). Censoring or left-truncation are specified in 'Surv' objects. The models are fitted by maximizing the full log-likelihood, and estimates and confidence intervals for any function of the model parameters can be printed or plotted. flexsurv also provides functions for fitting and predicting from fully-parametric multi-state models, and connects with the mstate package (de Wreede, Fiocco, and Putter 2011). This article explains the methods and design principles of the package, giving several worked examples of its use.
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- Authors
- Jackson, C.
- Affiliations
- MRC Biostatistics Unit (GB)
- Corresponding author
- Jackson, Christopher
- ORCID
- Jackson, Christopher
- Venue
- Journal of Statistical Software
- Publisher
- Foundation for Open Access Statistic
- Published
- 2016
- Volume
- 70
- Issue
- 8
- ISSN
- 1548-7660 (ISSN-L)
- PMC
- PMC5868723
- OpenAlex
- W2377410957
- Cited by
- 558
- References
- 48
- Citations by year
- 2026: 62 · 2025: 79 · 2024: 66 · 2023: 60 · 2022: 63 · 2021: 78 · 2020: 45 · 2019: 41 · 2018: 47 · 2017: 13 · 2016: 4
- FWCI
- 35.46
- Type
- journal article
- Language
- en
- Open access
- diamond
- doi.org
- Licence
- cc-by
- Locations
- Journal of Statistical Software (publishedVersion, cc-by)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- Medical Research Council (U015232027)
- Topics
- Physical Sciences › Mathematics › Statistics and Probability › Statistical Distribution Estimation and Applications
- Physical Sciences › Computer Science › Artificial Intelligence › Data Analysis with R
- Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods and Inference
- Keywords
- R package, generalized gamma distribution, F distribution, spline models, Royston-Parmar model, multi-state models, covariate effects, censoring, left truncation, log-likelihood maximization
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