Standardize Means

Provides a standardized effect size and its confidence interval for each group or level mean.

Usage

# Default S3 method
standardizeMeans(variable, mu=0, conf.level=.95, ...)

# S3 method for class 'data.frame'
standardizeMeans(frame, mu=0, conf.level=.95, ...)

# S3 method for class 'formula'
standardizeMeans(formula, mu=0, conf.level=.95, ...)

# S3 method for class 'wsm'
standardizeMeans(moments, mu=0, conf.level=.95, ...)

# S3 method for class 'bsm'
standardizeMeans(moments, mu=0, conf.level=.95, ...)

Arguments

variable

a numeric vector of data values

frame

a set of (non-empty) numeric vectors of data values

formula

a formula of the form lhs ~ rhs where lhs is a numeric variable giving the data values and rhs a factor giving the corresponding groups

moments

a matrix/frame of descriptive/summary statistics

mu

a number indicating the true/hypothesized value of the mean

conf.level

confidence level of the interval

Value

The returned frame contains the following components:

d

the standardized means

SE

the standard errors of the standardized means

LL

the lower limits of the confidence intervals of the standardized means

UL

the upper limits of the confidence intervals of the standardized means

References

Bonett, D. G. (2008). Confidence intervals for standardized linear contrasts of means. Psychological Methods, 13(2), 99-109.