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nominal
named
ordinal
named + order
interval
named + order + distance between ranks
ratio
named + order + distance between ranks + absolute zero
nominal
"having to do with names"
nominal
classification/categorization only
nominal
used in freqyency, proportion, and percentage
ordinal
used in median an centile
interval
possible to average and get a set
interval
used in mean, standard deviation, pearson's r, t-test, and ANOVA
ratio
all mathematical operations can be performed
ratio
the zero means it is non-existent
interval
the zero has a meaning or a description, it does not mean it's non-existent
directional relationship
happens because of the categories forming an ordered sequence between categories