size.cor: Sample size determination for testing the product-moment...

In miscor: Miscellaneous Functions for the Correlation Coefficient

Description

This function performs sample size computation for testing the product-moment correlation coefficient for H0: ρ = ρ0 based on precision requirements (i.e., type-I-risk, type-II-risk and an effect size).

Usage

size.cor(rho = NULL, delta, alternative = c("two.sided", "less", "greater"),
         alpha = 0.05, beta = 0.1, output = TRUE)

Arguments

rho	a number indicating the correlation coefficient under the null hypothesis, ρ0.
delta	minimum difference to be detected, δ.
alternative	a character string specifying the alternative hypothesis, must be one of "two.sided" (default), "greater" or "less".
alpha	type-I-risk, α.
beta	type-II-risk, β.
output	logical: if TRUE, output is shown.

Value

Returns an object of class size with following entries:

call	function call
type	type of the test (i.e., correlation coefficient)
spec	specification of function arguments
res	list with the result, i.e., optimal sample size

Author(s)

Takuya Yanagida [e-mail],

References

Rasch, D., Kubinger, K. D., & Yanagida, T. (2011). Statistics in psychology - Using R and SPSS. New York: John Wiley & Sons.

Rasch, D., Pilz, J., Verdooren, L. R., & Gebhardt, G. (2011). Optimal experimental design with R. Boca Raton: Chapman & Hall/CRC.

See Also

test.cor, seqtest.cor

Examples

#--------------------------------------
# H0: rho = 0.3, H1: rho != 0.3
# alpha = 0.05, beta = 0.2, delta = 0.2

size.cor(rho = 0.3, delta = 0.2, alpha = 0.05, beta = 0.2)

#--------------------------------------
# H0: rho <= 0.3, H1: rho > 0.3
# alpha = 0.05, beta = 0.2, delta = 0.2

size.cor(rho = 0.3, delta = 0.2, alternative = "greater",
         alpha = 0.05, beta = 0.2)

miscor documentation built on May 1, 2019, 10:14 p.m.