PSYC37H3 Chapter 4: Psychological Assessment - Chapter 4 Book Notes
Document Summary
Discrepancies between the true ability and measurement of ability form errors of measurement: error means that there will always be some inaccuracy in our measurements, tests that are relatively free of measurement error are said to be reliable. Charles spearman is responsible for the advanced development of reliability assessment: moivre introduced the basis notion of sampling error. Spearman worked out most of the basics of contemporary reliability theory. Item response theory (irt): uses computer technology to advance psychological measurement significantly. Irt is built on many of the ideas that spearman introduced. The observed score for each person always differs from the person"s true ability: the difference is the measurement error, a major assumption of the classical test theory is that errors of measurement are random. A growing movement is turning away from classical test theory because: classical test theory requires the exactly same items to be administered to each person.
