covrel {AATtools}  R Documentation 
Covariance MatrixBased Reliability Coefficients
Description
These functions allow for the computation of the reliability of a dataset from the covariance matrix of its variables.
Usage
calpha(covmat)
lambda2(covmat)
lambda4(covmat)
Arguments
covmat 
a covariance matrix 
Functions

calpha()
: Cronbach's alpha 
lambda2()
: Guttman's Lambda2 
lambda4()
: Guttman's Lambda4. This algorithm tries to get the highest attainable reliability by
See Also
Examples
# compute reliability from covariance
h<cov(iris[,1:4])
calpha(h)
lambda2(h)
lambda4(h)
# Lambda2 and Lambda4 are significantly larger because
# some of the variables in the iris dataset are negatively correlated.
[Package AATtools version 0.0.2 Index]