Stat Unit

The following table summarizes the relationship between central tendency, distribution shape, and levels of measurement -- with the preferred measures listed.

Preferred Measure of Central Tendency when:
?
Positively of Negatively Skewed		Symmetrical
?	?	?	?
Nominal?	Mode	Nominal?	Mode
Ordinal?	Mode or Median	Ordinal?	Mode or Median
Interval-Ratio?	Median	Interval-Ratio?	Mean

Remember to consider both distribution shape and measurement level when choosing the appropriate measure of central tendency.

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