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Quartiles

Returns the quartiles of a list.

$ wo 'Quartiles[Range[25]]'
{27/4, 13, 77/4}

A matrix is reduced columnwise.

$ wo 'Quartiles[{{1, 10}, {2, 20}, {3, 30}, {4, 40}}]'
{{3/2, 5/2, 7/2}, {15, 25, 35}}

A second argument supplies the Quantile parameters; the default is {{1/2, 0}, {0, 1}}.

$ wo 'Quartiles[{1, 2, 3, 4, 5, 6, 7, 8}, {{0, 0}, {1, 0}}]'
{2, 4, 6}