Central Tendency and how to measure it

Central Tendency is the flipside of variation. The term refers to the characterstics of data to "clump" together around some middle value, often called the "average." This later term is a cultural term, not statistical. It applies to one of three typical statistical measures of central tendency: the arithetic mean, all values in a distribution divided by the number of observations, most often called the average; the mode, or most common score (i.e. if you have 5 observations {3,5,5,4,2} the mode=5); and the median, the score that divides the upper half from the bottom half. To figure this latter measure for 50 observations, rank them from high to low and the median will be half-way been observations #25 and #26. You can find a more complete explanation on QuickMBA.com.

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