fuzzySurvival: Fuzzy Survival Analysis with Vague Event Times and Fuzzy
Censoring
Fuzzy survival analysis for data in which event times and/or
failure indicators are vague, for instance when a failure is only known to
have occurred during the second quarter of a year, or when it is uncertain
whether a subject lost to follow-up had in fact failed. Vague information
is represented by fuzzy numbers. The package provides a fuzzy
product-limit estimator obtained from nested alpha-cuts of the fuzzy
survival function, a fuzzy Cox proportional hazards model with fuzzy
coefficient and hazard ratio estimates, and a fuzzy log-rank test.
Type-reduction utilities for summarizing fuzzy estimates by single
numbers, a simulation engine for validation studies,
plotting, print and summary methods, and alpha-cut based confidence bands
are provided. The bounds are computed at the alpha-cuts of the fuzzy
event times, so the alpha-cut intervals returned for the survival
function, the regression coefficients and the test statistic are nested by
construction.
| Version: |
0.1.0 |
| Depends: |
R (≥ 4.1.0) |
| Imports: |
stats, graphics, grDevices, survival (≥ 3.2-13) |
| Suggests: |
testthat (≥ 3.0.0), knitr, rmarkdown, covr |
| Published: |
2026-10-15 |
| DOI: |
10.32614/CRAN.package.fuzzySurvival (may not be active yet) |
| Author: |
Mukul Bijalwan 
[aut, cre],
Gunjan Aggrwal [aut],
Mukul Jain [aut] |
| Maintainer: |
Mukul Bijalwan <mukulbijalwan555 at gmail.com> |
| License: |
MIT + file LICENSE |
| NeedsCompilation: |
no |
| Materials: |
README, NEWS |
| CRAN checks: |
fuzzySurvival results |
Documentation:
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