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Lecture

Lectures 3 and 4

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Department
Psychology
Course
PSY230H1
Professor
Ulrich Schimmack
Semester
Fall

Description
Lecture 3 - September 18, 2012  Taking multiple questions that are related and averageing the results reduces the effects of measurement error  Two ways to assess reliability: internal consistency  Split-half reliability (divide items into two variables, measure each, average it out)  Limit to how many times you can ask same questions to increase reliability even tho more items = higher measure of reliablilty  Retest reliability (test, and then after sometime retest and compare results) -- > better measure of reliability than internal consistency Bermuda Triangle of Causality  "C" unobserved variable (wasn't measured) that also causes A, and B  don't know how much each variable causes the other, too many unknowns  Correlation implies causality  Convergent validity: find two ways to measure the same thing and correlate them (should correlate high)  Discriminant validity: find two measures that measure different things and c
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