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Test-retest reliability refers to stability of a measure over
time. Many
factors can affect that stability, including poor
operational definitions. Thus,
if test-retest reliability is not high,
then faulty operational definitions
might be the cause. However,
it may simply be that the variable is inherently
not stable. For example,
if you measured the temperature of the outside air 20
days apart,
you may get different readings. However, the different readings are
most likely due to different weather patterns on those two days.