PSYC 406 Chapter Notes - Chapter 4: Item Response Theory, Classical Test Theory, Observational Error
27 Oct 2016
School
Department
Course
Professor
Document Summary
Module 2:1 reading: reliability: chapter 4 pages 102-111, and 118-129: Discrepancies between true ability and measurement of ability constitute errors of measurement. Error, in psychological testing, implies that there will always be some inaccuracy in our measurements. Our task is to find the magnitude of such errors and to develop ways to minimize them. Psychologists usually pursue complex traits such as intelligence, which one can neither see nor touch. Psychologists must assess their measuring instruments to determine how much error there is in them. Psychology owes the advanced development of reliability assessment to the work of charles. Later, kuder and richardson introduced several reliability coefficients. In recent years, sophisticated mathematical models have been developed to quantify latent variables based on multiple measures. More recently, item response theory (irt) has taken advantage of computer technology to advance psychological measurement significantly. Assumes that each person has a true score that would be obtained if there were no errors in measurement.
