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CRAN: Package copulaSQM

copulaSQM: Copula Based Stochastic Frontier Quantile Model

Provides estimation procedures for copula-based stochastic frontier quantile models for cross-sectional data. The package implements maximum likelihood estimation of quantile regression models allowing flexible dependence structures between error components through various copula families (e.g., Gaussian and Student-t). It enables estimation of conditional quantile effects, dependence parameters, log-likelihood values, and information criteria (AIC and BIC). The framework combines quantile regression methodology introduced by Koenker and Bassett (1978) <doi:10.2307/1913643> with copula theory described in Joe (2014, ISBN:9781466583221). This approach allows modeling heterogeneous effects across quantiles while capturing nonlinear dependence structures between variables.

Version: 0.1.0
Imports: ald, VineCopula, stats, graphics, MASS
Published: 2026-03-04
DOI: 10.32614/CRAN.package.copulaSQM
Author: Woraphon Yamaka [aut, cre], Paravee Maneejuk [aut], Nuttaphong Kaewtathip [aut]
Maintainer: Woraphon Yamaka <woraphon.econ at gmail.com>
License: GPL-3
NeedsCompilation: no
Materials: README
CRAN checks: copulaSQM results

Documentation:

Reference manual: copulaSQM.html , copulaSQM.pdf

Downloads:

Package source: copulaSQM_0.1.0.tar.gz
Windows binaries: r-devel: copulaSQM_0.1.0.zip, r-release: copulaSQM_0.1.0.zip, r-oldrel: copulaSQM_0.1.0.zip
macOS binaries: r-release (arm64): copulaSQM_0.1.0.tgz, r-oldrel (arm64): copulaSQM_0.1.0.tgz, r-release (x86_64): copulaSQM_0.1.0.tgz, r-oldrel (x86_64): copulaSQM_0.1.0.tgz

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