Cronbach's alpha and McDonald's omega are widely used reliability or internal consistency measures in social, behavioral and education sciences. Alpha is reported in nearly every study that involves measuring a construct through multiple test items. The package 'coefficientalpha' calculates coefficient alpha and coefficient omega with missing data and nonnormal data. Robust standard errors and confidence intervals are also provided. A test is also available to test the tauequivalent and homogeneous assumptions. Version 0.5 added the bootstrap confidence intervals.
Package details 


Author  Zhiyong Zhang and KeHai Yuan 
Date of publication  20150531 12:53:35 
Maintainer  Zhiyong Zhang <johnnyzhz@gmail.com> 
License  GPL 
Version  0.5 
Package repository  View on CRAN 
Installation 
Install the latest version of this package by entering the following in R:

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