Package: stratifyR
Type: Package
Title: Optimal Stratification of Univariate Populations
Version: 2.0-2
Date: 2026-10-14
Authors@R: c(
    person("Karuna G.", "Reddy",
           email   = "karuna.reddy@auckland.ac.nz",
           role    = c("aut", "cre"),
           comment = c(ORCID = "0000-0002-9467-4668")),
    person("M. G. M.", "Khan",
           email  = "mgm.khan@usp.ac.fj",
           role   = "aut")
  )
Description: Determines Optimum Strata Boundaries (OSB) and Optimum Sample
    Sizes (OSS) for univariate stratified sampling designs under Neyman
    allocation.  The stratification variable is described by a best-fitting
    parametric distribution, selected automatically by AIC from a set of
    continuous families (normal, log-normal, gamma, Weibull, exponential,
    Cauchy, uniform, Pareto, triangular and right-triangular), and the
    optimum boundaries are obtained by minimising the Neyman objective.
    Version 2.0 keeps the Dynamic Programming (DP) solver of Reddy and Khan
    (2020), which is globally optimal for the fitted distribution, as the
    default.  It adds two fast derivative-free solvers, a multi-start
    'COBYLA' solver and a two-phase global solver that couples 'DIRECT-L'
    with 'BOBYQA' refinement, and an exact solver that runs dynamic
    programming on the sorted data and returns the partition with the
    smallest empirical Neyman cost.  It also provides cost-constrained
    allocation with unequal per-stratum costs, a design-efficiency comparison
    (compare_designs), two- and three-dimensional and interactive
    visualisations, solution-quality diagnostics (a Cauchy-Schwarz optimality
    gap and KKT first-order residuals for the derivative-free solvers) and a
    self-contained 'shiny' application, while remaining backward compatible
    with the strata.data() and strata.distr() interface of version 1.x.  The
    methodology follows Khan et al. (2008)
    <https://www150.statcan.gc.ca/n1/pub/12-001-x/2008002/article/10761-eng.pdf>,
    Reddy and Khan (2018) <doi:10.1111/anzs.12244> and Reddy and Khan (2020)
    <doi:10.1111/anzs.12301>.
License: GPL (>= 3)
URL: https://github.com/karunaredz/stratifyR
BugReports: https://github.com/karunaredz/stratifyR/issues
Encoding: UTF-8
LazyData: true
Depends: R (>= 4.1.0)
Imports: stats, utils, graphics, grDevices, MASS, fitdistrplus (>=
        1.1.0), nloptr (>= 2.0.0), actuar, mc2d
Suggests: shiny, bslib, DT, readxl, stratification, plotly (>= 4.10.0),
        testthat (>= 3.0.0), knitr, rmarkdown, ggplot2, crayon,
        kableExtra, triangle
VignetteBuilder: knitr
RoxygenNote: 7.3.1
NeedsCompilation: no
Packaged: 2026-10-14 22:25:08 UTC; karunareddy
Author: Karuna G. Reddy [aut, cre] (ORCID:
    <https://orcid.org/0000-0002-9467-4668>),
  M. G. M. Khan [aut]
Maintainer: Karuna G. Reddy <karuna.reddy@auckland.ac.nz>
Repository: CRAN
Date/Publication: 2026-10-14 23:10:02 UTC
