Estimate Means Contrast

Provides the mean contrast, standard error, and confidence interval of the contrast.

Usage

# S3 method for data.frame
estimateMeansContrast(frame, contrast, conf.level=.95, ...)

# S3 method for formula
estimateMeansContrast(formula, contrast, conf.level=.95, ...)

# S3 method for wsm
estimateMeansContrast(moments, corrs, contrast, conf.level=.95, ...)

# S3 method for bsm
estimateMeansContrast(moments, contrast, conf.level=.95, ...)

Arguments

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

corrs

a matrix/frame of correlations among the measures

contrast

a vector of codes for the contrast among all means

conf.level

confidence level of the interval

Value

The returned frame contains the following components:

Est

the contrast among the means

SE

the standard error of the contrast

df

the degrees of the freedom for the contrast

LL

the lower limit of the confidence interval for the contrast

UL

the upper limit of the confidence interval for the contrast