Re: [R] Significance test, Cronbach's Alpha

From: Tom Backer Johnsen <>
Date: Mon 05 Jun 2006 - 20:34:34 EST

Jim Lemon wrote:
> Tom Backer Johnsen wrote:

>> Hello:
>> I am reviewing a paper at the moment where the author reports a 
>> Cronbach's Alpha and adds a significance test of the value.  I was not 
>> aware that such a test exists.  Does it?  If so, how is it done in R?

> Hi Tom,
> This may be due to the fact that some interpret Cronbach's alpha as a
> correlation between items, thus encouraging the unwary to assume that
> the probability of a numerically equivalent correlation can be used as a
> test of significance.

That is exactly what I suspect. Actually, it is not too far off, but definitely not the same.


| Tom Backer Johnsen, Psychometrics Unit,  Faculty of Psychology |
| University of Bergen, Christies gt. 12, N-5015 Bergen,  NORWAY |
| Tel : +47-5558-9185                        Fax : +47-5558-9879 |
| Email :    URL : |

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