Determine sample size with Equivalence interval Bayes factor method

A Bayesian statistical testing approach aimed at establishing equivalence between two groups.

ssp_eq_bf(
  tpr,
  eq_band,
  delta,
  thresh = 10,
  tol = 1e-04,
  granularity = 300,
  prior_location = 0,
  prior_scale = 1/sqrt(2),
  max_n = 10001
)

eq_bf(
  n1,
  eq_band,
  delta,
  thresh,
  tol,
  granularity,
  prior_location,
  prior_scale
)

Arguments

tpr	Numeric. The desired long-run probability of obtaining a Bayes factor at least as high as the Threshold, given Delta.
eq_band	Numeric. The chosen width of the equivalence region.
delta	Numeric. The expected population effect size.
thresh	Integer. Critical threshold for the Bayes factor.
tol	Numeric. Relative accuracy requested.
granularity	Numeric. Relative precision of the tpr estimates, higher values mean more precision.
prior_location	Numeric. Location of the Cauchy prior distribution.
prior_scale	Numeric. Scale of the Cauchy prior distribution.
max_n	Integer. The maximum number of participants per group (both groups are assumed to have equal sample size).

Value

The function returns a list of two named numeric vectors. The first `n1` the determined sample size per group. The third `tpr_out` is the TPR corresponding to the determined sample sizes.

Examples

if (FALSE) {
SampleSizePlanner::ssp_eq_bf(tpr = 0.8, delta = 0, eq_band = 0.2, thresh = 10)
}