A few class periods ago, someone asked about the difference between a Likert and a Guttman scale and I punted. Assuming you learned Likert scales in your research methods class, a Gutman scale is different because each higher answer assumes agreement with all the lower answers. In other words, the choices are not mutually exclusive- each higher answer includes ALL the lower answers as a subset. One example: How far did your math training go? A: algebra. B: Trigonometry. C: Calculus. D: Higher than Calculus. (We assume that if you answer C you also mean that you took algebra and trig.)
Or, asked of a four year old: Can you count up to the following number? A: 5. B: 20. C: 100. D: 1000. (We assume that a child who can count to 100 can also count to 20.)
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