On Sat, Jun 10, 2017 at 02:14:11PM +0300, Elias Estatistics wrote:
What means "Mean Average" inside aggregated menu (selections)?
Can you explain me in order to translate it properly?
I can find any relevant reference about that math phrase
There are various types of average:
Median Average:
This is the value which half of the samples fall above and half fall below.
Eg: the median of 1 2 3000000 = 2
Mode Average:
This is the value which more samples have, than any other value.
Eg: the mode of 1 2 3 3 3 78 = 3
Mean Average: Sometimes called the "Pythagorean Mean" [1]
There are in fact (at least) 3 different types of "Mean Average", however
the term usually refers to the "Arithmetic Mean Average" unless the context
makes otherwise clear:
Arithmetic Mean Average: (\sum_{i=0}^{n-1} x_i ) / n
Eg: Arithmetic Mean of 1 2 3000000 = 1000001
Geometric Mean Average: (\prod_{i=0}^{n-1} x_i ) ^ {1/n}
Eg: Geometric Mean of 1 2 3000000 = 181.711 (approx)
Harmonic Mean Average: n / (\sum_{i=0}^{n-1} 1/x_i )
Eg: Harmonic Mean of 3 4 5 = 3.829 (approx)
Hope this helps,
John
[1] https://en.wikipedia.org/wiki/Pythagorean_means
(Like the wikipedia article says, the Greeks have studied the subject in great
depth!)
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