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Attribute Types
- Nominal: categories, states, or “names of things”
- Hair_color = {auburn, black, blond, brown, grey, red, white}
- marital status, occupation, ID numbers, zip codes
- Binary
- Nominal attribute with only 2 states (0 and 1)
- Symmetric binary: both outcomes equally important
- e.g., gender
- Asymmetric binary: outcomes not equally important.
- e.g., medical test (positive vs. negative)
- Convention: assign 1 to most important outcome (e.g., HIV positive)
- Ordinal
- Values have a meaningful order (ranking) but magnitude between successive values is not known.
- Size = {small, medium, large}, grades, army rankings
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