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from __future__ import absolute_import, print_function, division
from petl.test.helpers import eq_
from petl.util.statistics import stats
def test_stats():
table = (('foo', 'bar', 'baz'),
('A', 1, 2),
('B', '2', '3.4'),
('B', '3', '7.8', True),
('D', 'xyz', 9.0),
('E', None))
result = stats(table, 'bar')
eq_(1.0, result.min)
eq_(3.0, result.max)
eq_(6.0, result.sum)
eq_(3, result.count)
eq_(2, result.errors)
eq_(2.0, result.mean)
eq_(2/3, result.pvariance)
eq_((2/3)**.5, result.pstdev)
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