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effectus tells you which minority of causes provokes which majority of effects.

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Pypi version Python versions Windows Built Status Code coverage


You provide it with a series of numbers. It tells you whether a pareto distribution is present.


Mean, Median and Most likely value regularly hide that a minority of causes provokes a majority of effects.

The Fallacy of the Arithmetic Mean explains the situation in-depth.


First, install it:

$ pip3 install effectus

Then, in your Python shell do:

from effectus import Effects
Effects([789, 621, 109, 65, 45, 30, 27, 15, 12, 9])
<pareto present [0.707]: 1/5 causes => 4/5 effects [total : 2.3 %]>

If you want 80% of results, you need only 20% of causes.

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