NEWS

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SimVitD 1.0.5 (2026-07-16)

• Corrected bug in application of holding time through a rewrite of relevant code- a logical error triggered for holding.time greater than 0 meant overlapping times were not always blocked properly impacting power calculations (usually underestimating power)
• Changed default of holding.time to be more sensible value of 0 throughout package
• Package vignette updated to reflect some recent changes in package dependencies and updating of examples

SimVitD 1.0.4 (2026-06-25)

• Addition of some code to set up the parallel calls more robustly

SimVitD 1.0.3 (2023-08-20)

• Cosmetic changes to some man files to resolve erroneous (clashing) version numbers
• Some checks for objects of S3 types were made using string comparsions instead of inherits, these have been corrected

SimVitD 1.0.2 (2022-04-02)

• Added functions from wBoot by Neil A Weiss into package due to archival
• Due to wBoot incorporation dependency changed to simpleboot
• Included CLT approximation to be used when larger samples
• Determination of CLT/bootstrap is carried out automatically- clt argument to power.calc can be used to set
• Change default number of bootstrap re-samples to 9999

SimVitD 1.0.1 (2022-01-18)

Minor changes

• Added extra argument start to exposure.levels() to pass the time unit in years of study start
• Corrected bug in time offset of exposure levels when start > 0
• Changed default plotting label for 25OHD from '25 Hydroxy Vitamin D' to '25-hydroxyvitamin D'
• Added new function 'vitd.curve.2.function' which will convert the output of vitd.curve into a list of callable functions (not available at user level)

SimVitD 1.0.0

Major changes

• Generative model of vitamin D status curves from a squared sine to cosine with threshold.
• Rather than maximum and minimum levels of vitamin D a more flexible mean level is now used.
• Changes to arguments passed to vitd.curves().
• Cross-over designs have been disabled in current version.
• Parallel computation is now available for Monte Carlo error quantification in pow.calc().
• Addition of internal function power.calc.0().
• prop.test() and wilcox.test() used in version 0.1.2 replaced by non-parametric bootstrap from wBoot package.
• Dependency on poisson package removed as it was possible to vectorize our own sampling.
• Updated print and summary function for exposure.levels and infection.count objects.
• Changes to package vignette to document user facing changes.