Lecture 6 - Lecture 6 I Levels of Measurement A...

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Lecture 6 I. Levels of Measurement A. Nominal (categorical/discrete): 1. Variable is measured merely with different categories. 2. Check a box, (which one are you, i.e. gender). a. Categories must be mutually exclusive. (Can only be one checked answer) b. Categories must be exhaustive. (There has to be an option for everyone to check) Ex. Sex (m/f); ethnicity: yes/no Q’s; TV viewing (Hi, Med., Low) B. Ordinal 1. Variable is measured with rank ordered categories. a. Ex. Rank top five favorite TV shows b. Ex. Olympic medal winners, gold, silver, bronze. C. Interval 1. Variable is measured with successive points on a scale with equal intervals. (How much do you approve) a. Example measure on immigration policy opinion: b. The U.S. should build a fence along the boarder. Strongly disagree 1 2 3 4 5 6 7 strongly agree D. Ratio 1. Interval measurement with a true, meaningful zero point. a. Time in seconds, weight in lbs. etc. b. Ex. Test scores (if from 0 possible) 2. Interval and ratio measures are “continuous” variables.
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