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An (upper) level set of a function is the set of inputs for which the function value is at or above a specified threshold. (Also called an excursion set). Applications of level sets include confidence or credible regions for parameters of statistical models, where the function is the likelihood or posterior density; regions where classification rules assign high probability to a given class; and scientific or engineering models where one is interested in input regions for which model output is above a threshold. This package maps out the boundary of a level set by finding its intersections with collections of 1-dimensional rays, generalizing a proposal by Kim and Lindsay (Statistica Sinica 21:923-948, 2011). Tools are provided to generate rays, find intersections, and visualize results. The package makes few assumptions about the studied function: it may be discontinuous, it may have a complicated feasible region, and the target level set may be non-convex or have multiple, disconnected parts. Vignettes describe package usage and show examples with two to five input space dimensions.
| Version: | 0.8.2 |
| Depends: | R (≥ 3.5.0) |
| Imports: | graphics, stats, tools, utils, proxy, withr |
| Suggests: | ggplot2, randomForest, palmerpenguins, knitr, rmarkdown |
| Published: | 2026-06-22 |
| DOI: | 10.32614/CRAN.package.levelSets |
| Author: | Richard Raubertas [aut, cre] |
| Maintainer: | Richard Raubertas <rrprf at emvt.net> |
| License: | GPL (≥ 3) |
| NeedsCompilation: | no |
| Materials: | NEWS |
| CRAN checks: | levelSets results |
| Reference manual: | levelSets.html , levelSets.pdf |
| Vignettes: |
The levelSets Package (source, R code) Problem Setup (source, R code) Confidence Regions (source, R code) Classifiers (source, R code) |
| Package source: | levelSets_0.8.2.tar.gz |
| Windows binaries: | r-devel: levelSets_0.8.2.zip, r-release: not available, r-oldrel: levelSets_0.8.2.zip |
| macOS binaries: | r-release (arm64): levelSets_0.8.2.tgz, r-oldrel (arm64): levelSets_0.8.2.tgz, r-release (x86_64): levelSets_0.8.2.tgz, r-oldrel (x86_64): levelSets_0.8.2.tgz |
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These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.