Calculate Cronbach's alpha coefficient.

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Description

Calculate Cronbach's alpha coefficient from a matrix or data.frame with more than 2 columns.

Usage

1

Arguments

X

A matrix or data.frame with more than 2 columns.

Value

Single numeric value of Cronbach's alpha.

Author(s)

Minato Nakazawa minato-nakazawa@umin.net http://minato.sip21c.org/

References

Bland JM, Altman DG (1997) Statistics notes: Cronbach's alpha. BMJ, 314: 572.

Examples

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 QUEST <- data.frame(
  Q1=c(1, 5, 2, 3, 4, 2, 3, 4, 3, 2), 
  Q2=c(2, 4, 1, 2, 4, 1, 2, 5, 2, 1), 
  Q3=c(2, 5, 1, 3, 3, 2, 2, 4, 2, 2))
 CronbachAlpha(QUEST)

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