PSYC 201W Lecture Notes - Lecture 4: Psycinfo, Stratified Sampling, Convenience Sampling
8 Oct 2016
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Ch 5: september 30, 2016: variable & measurement, variable: condition or characteristic that takes on different values or categories. Needs to be accurately measured or else the study is flawed: measurement: assignment of symbols or #s to something according to a set of rules. = different statistical approaches to getting data: psychometric properties of good measurement, reliability: consistency or stability of scores of your measurement instrument. Validity: extent to which your measurement procedure is measuring what you think it is measuring & whether you have interpreted your scores correctly. 3. a measure w/ no reliability necessarily has no validity. E. g. shooting zombies on the head - validity; shots are close together - reliability [reliability -> validity] High reliability + high validity: types of reliability, test-retest reliability: consistency of individual scores over time. Same test given to individuals 2 times. How long to wait between tests - typically an increase in time between testings will decrease reliability.
