PSYC 201W Lecture Notes - Lecture 4: Level Of Measurement, Systematic Sampling, Content Validity
2 Sep 2015
School
Department
Course
Professor
Document Summary
Variable and measurement: variable [not constant; e. g. gender, reaction time] A condition or characteristic that can take on different values or categories: measurement. The assignment of symbols or numbers to something according to a set of rules. Use of symbols to classify or categorize: ordinal scale. Equal distances on scale not necessarily equal on dimension being measured: interval scale. Equal distances between adjacent numbers: ratio scale [weight, height, length, kevin scale, reaction time] Same properties of other scales plus absolute zero point. Refers to the consistency or stability of the scores of your measurement instrument: validity [x reliability no validity] [without reliability, validity is nothing] Refers to the consistency or stability of the scores of your test, assessment, instrument, or raters: test-retest reliability. Same test administered to individuals two times. How long to wait between tests: typically an increase in time between testings will decrease reliability, equivalent-forms reliability. Consistency of scores on two versions of test.
