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trialSizing: Tools for Experimental Design Sizing

Sizes field experiments from uniformity-trial data, following the relationship between the coefficient of variation and plot size. Checks a trial for the spatial structure the sizing methods assume (semivariogram, Moran's I, kriged field map), summarises the coefficient of variation over every plot shape the grid admits, and estimates the optimal plot size by the modified maximum curvature method of Meier and Lessman (1971), by the linear response plateau (LRP) and quadratic response plateau (QRP) models, and by the closed form of Paranaiba, Ferreira and Morais (2009), which can be compared side by side. From the coefficient of variation at the optimum it derives the number of replications needed to detect a given difference between treatment means, as in Cargnelutti Filho and others (2014). Every method returns standardised diagnostic statistics, optional bootstrap uncertainty for the breakpoint, and publication-style plots.

Version: 0.1.0
Depends: R (≥ 3.5)
Imports: ggplot2, stats, utils
Suggests: knitr, rmarkdown, patchwork, testthat (≥ 3.0.0)
Published: 2026-08-05
DOI: 10.32614/CRAN.package.trialSizing
Author: Willyan Bandeira ORCID iD [aut, cre], Leonardo Pradebon ORCID iD [aut], Ivan Carvalho ORCID iD [aut], Murilo Loro ORCID iD [aut]
Maintainer: Willyan Bandeira <bandeira.wjab at gmail.com>
BugReports: https://github.com/willyanjnr/trialSizing/issues
License: GPL (≥ 3)
URL: https://willyanjnr.github.io/trialSizing/, https://github.com/willyanjnr/trialSizing
NeedsCompilation: no
Language: en
Materials: README, NEWS
CRAN checks: trialSizing results

Documentation:

Reference manual: trialSizing.html , trialSizing.pdf
Vignettes: Checking a uniformity trial (source, R code)
Comparing the methods (source, R code)
CV by plot shape (source, R code)
Linear Response Plateau (LRP) (source, R code)
Modified Maximum Curvature (MCM) (source, R code)
The Paranaiba method (source, R code)
Quadratic Response Plateau (QRP) (source, R code)
Number of replications (source, R code)
Validation on simulated fields (source, R code)

Downloads:

Package source: trialSizing_0.1.0.tar.gz
Windows binaries: r-devel: trialSizing_0.1.0.zip, r-release: trialSizing_0.1.0.zip, r-oldrel: trialSizing_0.1.0.zip
macOS binaries: r-release (arm64): trialSizing_0.1.0.tgz, r-oldrel (arm64): trialSizing_0.1.0.tgz, r-release (x86_64): trialSizing_0.1.0.tgz, r-oldrel (x86_64): trialSizing_0.1.0.tgz

Linking:

Please use the canonical form https://CRAN.R-project.org/package=trialSizing to link to this page.

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.
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