Internal consistency is
typically a measure based on the correlations between
different items on the same test (or the same subscale on a larger test). It measures
whether several items that propose to measure the same general construct
produce similar scores.
Internal
consistency is usually measured with Cronbach's alpha, a statistic calculated
from the pairwise correlations between items. Internal consistency ranges
between zero and one. A commonly accepted rule of thumb for describing internal
consistency is as follows:
Internal consistency
|
|
α ≥ .9
|
Excellent
|
.9 > α ≥ .8
|
Good
|
.8 > α ≥ .7
|
Acceptable
|
.7 > α ≥ .6
|
Questionable
|
.6 > α ≥ .5
|
Poor
|
.5 > α
|
Unacceptable
|
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