Reliability of test scores9/15/2023 ![]() ![]() ![]() This means that observed scores combine ability (or knowledge) and error. There are many influences on behavior the ones we’re not interested in can obscure the ones we are interested in that makes our inferences problematicģ Observed Scores O = T + e O = Observed score T = True score e = error Ability is not directly observable we have to infer true values for things like intelligence or aptitude. How We Deal with Sources of Error: Domain sampling – test items Time sampling – test occasions Internal consistency – traits Reliability in Observational Studies Using Reliability Information What To Do about Low ReliabilityĢ Chapter 4 - Reliability Measurement of human ability and knowledge is challenging because: ability is not directly observable – we infer ability from behavior all behaviors are influenced by many variables, only a few of which matter to us Whatever I say about ability here applies to knowledge as well. 1 Chapter 4 – Reliability Observed Scores and True Scores Error ![]()
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