PwrRTest: power, sample size, correlation or level of the test of
zero correlation, with exactly one argument NULL (Cohen's
Fisher-z approximation as in pwr.r.test). CohenRMagnitude:
Cohen's small (.10), medium (.30) and large (.50) labels. Identical to
the Python arm morie.fn.corrpower.
Usage
PwrRTest(
n = NULL,
r = NULL,
sig_level = 0.05,
power = NULL,
alternative = "two.sided"
)
CohenRMagnitude(r)
Arguments
- n
Sample size.
- r
Correlation under the alternative.
- sig_level
Significance level.
- power
Power.
- alternative
One of "two.sided", "less", "greater".
Value
List (character label for CohenRMagnitude).
References
Cohen, J. (1988). Statistical Power Analysis for the
Behavioral Sciences, 2nd edn. Lawrence Erlbaum.
Lovett, B. J. (2021). Practical Psychometrics: A Guide for Test Users.
Guilford Press.
Examples
PwrRTest(n = 100, r = 0.3)$power
#> [1] 0.8647715
PwrRTest(r = 0.3, power = 0.8)$n
#> [1] 84.07364
CohenRMagnitude(0.35)
#> [1] "medium"
