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Exercise: Reliability of balance performance measures
in chronic stroke patients, answer 1

Question 1: Why do the authors refer to the intra-class correlation coefficient as
a "relative" reliability index?

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Suggested answer:

The ICC is the ratio of the variance of the thing being measured
to the variance of the measurement of the thing.
In other words, it is the variance of the true values divided by
the variance of the measured values, which is the variance of the true values
plus the measurement error variance.

Hence as an index of measurement error, ICC is relative to the variability
in the population being measured.

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