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6 Terms

1
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Discrete variables

countable and finite # of values: limited

2
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Continuous variables

variables whose values are not countable and have an infinite # of possibilities: they are continous

3
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Nominal

qualitative, no natural order or ranking, ex: genotype, bloodtype, zip code, gender, race, eyecolor

4
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ordinal

qualitative, order matters but there is no difference between values

5
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Interval

quantitative, order and difference between values exist

6
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ratio

quantitative, all the properties of an interval variable + a true 0. When there is a 0, it means there is none of that variable, ex:weight, height,wage