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what are the 4 classes of attribute data
nominal
ordinal
interval
ratio
nominal =
names
ordinal =
order
interval =
numbers (no absolute zero)
categories with a specific ‘order’
ratio =
numbers (with absolute zero)
operations for nominal attribute classes
=
testing for equality
operations for ordinal attribute classes
<, =, >
operations for interval attribute classes
<, =, >, -
operations for ratio attribute classes
<, =, >, -, /
what is the difference between “interval” and “ratio” attribute classes?
interval - no absolute zero point, cannot work with proportion
ratio - has an absolute zero point, can work with proportion or allows division