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 non-normal data. Robust standard errors and confidence intervals are also provided. A test is also available to test the tau-equivalent and homogeneous assumptions. Version 0.5 added the bootstrap confidence intervals.

Author | Zhiyong Zhang and Ke-Hai Yuan |

Date of publication | 2015-05-31 12:53:35 |

Maintainer | Zhiyong Zhang <johnnyzhz@gmail.com> |

License | GPL |

Version | 0.5 |

**alpha:** Robust Cronbach's alpha and McDonald's omega

**bootstrap:** Bootstrap se and CI for alpha and omega

**coefficientalpha-package:** Robust Cronbach's alpha and McDonald's omega with missing and...

**example:** An example data set

**plot.alpha:** Alpha/Omega related plot

**summary.alpha:** Print alpha/omega and its confidence interval.

**tau.test:** Test the tau-equivalence and the homogeneity of items

coefficientalpha

coefficientalpha/inst

coefficientalpha/inst/doc

coefficientalpha/inst/doc/manual.pdf

coefficientalpha/NAMESPACE

coefficientalpha/data

coefficientalpha/data/example.txt.gz

coefficientalpha/R

coefficientalpha/R/Cronbach.R
coefficientalpha/MD5

coefficientalpha/DESCRIPTION

coefficientalpha/man

coefficientalpha/man/bootstrap.Rd
coefficientalpha/man/tau.test.Rd
coefficientalpha/man/coefficientalpha-package.Rd
coefficientalpha/man/plot.alpha.Rd
coefficientalpha/man/alpha.Rd
coefficientalpha/man/summary.alpha.Rd
coefficientalpha/man/example.Rd
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