designSaviT3WantEsMin: Helper function to designing a Savi T-test (output esMin)

In safestats: Safe Anytime-Valid Inference

Helper function to designing a Savi T-test (output esMin)

Description

Finds the parameter and esMin when provided with only alpha, power, and nPlan

Usage

designSaviT3WantEsMin(
  power,
  nPlan,
  alpha = 0.05,
  alternative = c("twoSided", "greater", "less"),
  testType = c("oneSample", "paired", "twoSample"),
  parameter = NULL,
  beta = NULL,
  eType = c("mom", "eGauss", "imom", "eCauchy", "grow", "lai"),
  lowEsTrue = 0.01,
  highEsTrue = 3,
  ...
)

Arguments

power	numeric in (0, 1) that specifies the desired power, that is, the targetted chance to stop in favour of the alternative over the null hypothesis, when the alternative holds true. Note that prior to version 0.8.8 power <- 1-beta. The "beta" argument does not need to be specified anymore.
nPlan	optional numeric vector of length at most 2, see scenario 2 and 3 above.
alpha	numeric in (0, 1) that specifies the tolerable type I error and the null rejection rule e >= 1/alpha.
alternative	a character string specifying the alternative hypothesis. Must be one of "twoSided" (default), "greater" or "less".
testType	either one of "oneSample", "paired", "twoSample".
parameter	numeric, an optional savi test defining parameter. Default set to NULL. and adapts to meanDiffMin and eType, see matchEParameterWith for details.
beta	numerical in (0,1). Old parameter now replaced by the power parameter
eType	character one of "mom", "grow", "eGauss", and "eCauchy". "mom" is default and uses a non-local moment prior with bump(s) at meanDiffMin, "grow" uses point prior(s) at meanDiffMin, "eGauss" a zero-centred normal prior, "eCauchy" a zero centred Cauchy prior.
lowEsTrue	numeric, lower bound for the candidate set of the targeted minimal clinically relevant effect size for scenario 3.a.
highEsTrue	numeric, upper bound for the candidate set of the targeted minimal clinically relevant effect size for scenario 3.a.
...	further arguments to be passed to or from methods, but mainly to perform do.calls.

Value

A list with the parameter and the targeted esMin amongst other items

References

Grünwald, P. D., de Heide, R., & Koolen, W. (2024). Safe testing. Journal of the Royal Statistical Society. Series B (Methodological), 86(5), 1091-1128. (With discussions), https://doi.org/10.1093/jrsssb/qkae011. Ly, A, Boehm, Grünwald, P. D., Ramdas, A., & van Ravenzwaaij, D. (2024). Safe Anytime-Valid Inference: Practical maximally flexible sampling designs for experiments based on e-values. PsyArXiv Preprint, https://doi.org/10.31234/osf.io/h5vae.

Examples

designSaviT3WantEsMin(power=0.7, nPlan=10)

safestats documentation built on Sept. 6, 2026, 1:06 a.m.