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abstraction > mathematical concept > number > quantity > statistical quantity

statistical quantity
subject			fact

statistical quantity	is a kind of quantity
	is a kind of statistical concept
quantity	has unit
number	has value

Kinds of statistical quantity :

• kurtosis (2 facts) - The peakedness or flatness in the graphical representation of a statistical distribution.
• median (2 facts) - Literally the middle value in a sequence of values arranged in increasing size order. A useful mathematical estimator of the true value from a set of values when one of these values is contaminated, i.e. known to be much larger than the average.
• probable error (3 facts) (p.e.) - The error which will not be exceeded by 50 percent of the cases. The probable error is equal to 0.6745 times the standard error.
• root mean square (3 facts) (rms) - The square root of the mean square value of a set of numbers (see also random walk).
• standard deviation (3 facts) (σ) - The root mean square deviation from the arithmetic mean.
• standard error (3 facts) (s.e.) - The standard deviation of a distribution of means or any other statistical measure computed from samples. It is equal to 1.4826 times the probable error.
• statistical error (2 facts) - The uncertainty resulting from a measurement of purely random events. Such an uncertainty is defined as bracketing a range of values within which the correct value has a 66% chance of lying. For example, a value of (100 ± 10) obtained from a given measurement means that the true value has a 66% chance of lying between 90 and 110, and a 34% chance of being either above or below this range.