Range of error of measurement

© Paul Cooijmans


Range of error is the full range of the expected error; that is, the full range of an individual's scores if it were possible to take the test indefinitely without a learning effect between the test administrations. A rule of thumb for interpreting the range of error: One's true score on the test in question lies with virtual certainty within a band of one range of error.

Range of error is computed similarly to standard error, but with the test's raw score range instead of its standard deviation.

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