fixedHajnal.twot_es {NAP} | R Documentation |
Fixed-design two-sample t
-tests with NAP for varied sample sizes
Description
In two-sided fixed design two-sample t
-tests with composite alternative prior assumed on the difference between standardized effect sizes (\mu_2 - \mu_1)/\sigma
under the alternative, this function calculates the expected log(Hajnal's ratio) at a prefixed standardized effect size for a varied range of sample sizes.
Usage
fixedHajnal.twot_es(es = 0, es1 = 0.3, n1min = 20, n2min = 20,
n1max = 5000, n2max = 5000,
batch1.size.increment, batch2.size.increment,
nReplicate = 50000)
Arguments
es |
Numeric. Difference between standardized effect sizes where the expected weights of evidence is desired. Default: |
es1 |
Positive numeric. |
n1min |
Positive integer. Minimum sample size from Grpup-1 to be considered. Default: 20. |
n2min |
Positive integer. Minimum sample size from Grpup-2 to be considered. Default: 20. |
n1max |
Positive integer. Maximum sample size from Grpup-1 to be considered. Default: 5000. |
n2max |
Positive integer. Maximum sample size from Grpup-2 to be considered. Default: 5000. |
batch1.size.increment |
Positive numeric. Increment in sample size from Group-1. The sequence of sample size thus considered from Group-1 for the fixed design test is from |
batch2.size.increment |
Positive numeric. Increment in sample size from Group-2. The sequence of sample size thus considered from Group-2 for the fixed design test is from |
nReplicate |
Positve integer. Number of replicated studies based on which the expected weights of evidence is calculated. Default: 50,000. |
Value
A list with two components named summary
and BF
.
$summary
is a data frame with columns n
containing the values of sample sizes and avg.logBF
containing the expected log(Hajnal's ratios) at those values.
$BF
is a matrix of dimension number of sample sizes considered
by nReplicate
. Each row contains the Hajnal's ratios at the corresponding sample size in nReplicate
replicated studies.
Author(s)
Sandipan Pramanik and Valen E. Johnson
References
Hajnal, J. (1961). A two-sample sequential t-test.Biometrika, 48:65-75, [Article].
Schnuerch, M. and Erdfelder, E. (2020). A two-sample sequential t-test.Biometrika, 48:65-75, [Article].
Examples
out = fixedHajnal.twot_es(n1max = 100, n2max = 100)