Functionality for the most common single test reliability estimates is provided: Coefficient Alpha, Guttman's lambda2/4/6, greatest lower bound and Mcdonald's Omega. The Bayesian estimates are provided with credible intervals. The method for the Bayesian estimates, except for omega, is sampling from the posterior inverse Wishart for the covariance matrix based measures. See Murphy (2007) <https://www.seas.harvard.edu/courses/cs281/papers/murphy2007.pdf>. Gibbs Sampling from the joint conditional distributions of a single factor model in the case of omega. See Lee (2007, ISBN:9780470024249). Methods for the glb are from Moltner and Revelle (2018) <https://www.rdocumentation.org/packages/psych/versions/1.8.10/topics/glb.algebraic>; lambda4 is from Benton (2015) <doi:10.1007/9783319075037_19>; the principal factor analysis is from Schlegel (2017) <https://www.rbloggers.com/iteratedprincipalfactormethodoffactoranalysiswithr/>; and the analytic alpha interval is from Bonnett and Wright (2014) <doi:10.1002/job.1960>.
Package details 


Author  Julius Pfadt and Don van den Bergh 
Maintainer  Julius Pfadt <[email protected]> 
License  GPL3 
Version  0.1.2 
Package repository  View on GitHub 
Installation 
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