Implements Higher-Order Influence Function (HOIF) estimators of the Average Treatment Effect (ATE), following Robins et al. (2008) <doi:10.1214/193940307000000527>, Liu et al. (2017) <doi:10.48550/arXiv.1705.07577> and Liu and Li (2023) <doi:10.48550/arXiv.2302.08097>. Estimators of any order are supported, with optional covariate basis transformations (B-splines, Fourier) and optional K-fold sample splitting (cross-fitting) for improved finite-sample performance. The core higher-order U-statistics are computed exactly via the 'ustats' package, an R interface to the 'Python' package 'u-stats'; the underlying algorithm and its computational complexity are analyzed in Chen, Zhang and Liu (2025) <doi:10.48550/arXiv.2508.12627>. A pure R implementation (up to order 6) is also provided as a fallback that does not require 'Python'.
| Version: | 0.2.0 |
| Depends: | R (≥ 4.0.0) |
| Imports: | splines, corpcor, SMUT, ustats (≥ 0.1.5) |
| Suggests: | MASS, testthat (≥ 3.0.0), reticulate, knitr, rmarkdown |
| Published: | 2026-06-24 |
| DOI: | 10.32614/CRAN.package.HOIF |
| Author: | Xingyu Chen [aut, cre], Lin Liu [aut] |
| Maintainer: | Xingyu Chen <xingyuchen0714 at sjtu.edu.cn> |
| BugReports: | https://github.com/cxy0714/HOIF/issues |
| License: | MIT + file LICENSE |
| URL: | https://cxy0714.github.io/HOIF/, https://github.com/cxy0714/HOIF |
| NeedsCompilation: | no |
| SystemRequirements: | For the default Python backend: Python (>= 3.11) with the 'u-stats', 'numpy' and 'torch' packages (provisioned automatically on first use via 'reticulate', or via ustats::setup_ustats()). Not needed when pure_R_code = TRUE. |
| Language: | en-US |
| Materials: | NEWS |
| CRAN checks: | HOIF results |
| Reference manual: | HOIF.html , HOIF.pdf |
| Vignettes: |
Introduction to HOIF: Higher-Order Influence Function Estimators for the ATE (source, R code) |
| Package source: | HOIF_0.2.0.tar.gz |
| Windows binaries: | r-devel: HOIF_0.2.0.zip, r-release: HOIF_0.2.0.zip, r-oldrel: HOIF_0.2.0.zip |
| macOS binaries: | r-release (arm64): HOIF_0.2.0.tgz, r-oldrel (arm64): HOIF_0.2.0.tgz, r-release (x86_64): HOIF_0.2.0.tgz, r-oldrel (x86_64): HOIF_0.2.0.tgz |
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