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Chapter-5dv

# Chapter-5dv - Can you do it again Reliability and Other...

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Can you do it again? Reliability and Other Desired Characteristics Linn and Gronlund Chap.. 5

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In a nutshell… Reliability is the consistency of a measurement. Today and next class we will look at: 6 ways to estimate reliability The standard error of measurement What influences reliability Cut scores One slide on usability or practical considerations

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Reliability via a mathematical proof. X = T + E X = Obtained or observed score (fallible) T = True score (reflects stable characteristics) E = Measurement error (reflects random error)
Some initial thoughts… All measurement is susceptible to error. Any factor that introduces error into the measurement process effects reliability. To increase our confidence in scores, we try to detect, understand, and minimize random measurement error.

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More initial thoughts Just like validity, when talking about reliability one talks about the scores, not the test or assessment. Validity is the sum of its parts, reliability is only valid in its parts. (let me explain…) One must have reliability to have validity. (Again, validity must have consistency.)
Error from Content Sampling… Many theorists believe the major source of random measurement error is “Content Sampling.” Since tests represent performance on only a sample of behavior, the adequacy of that sample is very important.

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And from temporal instability… Random measurement error can also
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Chapter-5dv - Can you do it again Reliability and Other...

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