Lines Matching defs:variance
5 averages, variance, and standard deviation.
56 pvariance Population variance of data.
57 variance Sample variance of data.
127 'variance',
822 def variance(data, xbar=None):
823 """Return the sample variance of data.
830 calculate the variance from the entire population, see ``pvariance``.
835 >>> variance(data)
842 >>> variance(data, m)
852 >>> variance([D("27.5"), D("30.25"), D("30.25"), D("34.5"), D("41.75")])
856 >>> variance([F(1, 6), F(1, 2), F(5, 3)])
862 raise StatisticsError('variance requires at least two data points')
867 """Return the population variance of ``data``.
873 Use this function to calculate the variance from the entire population.
874 To estimate the variance from a sample, the ``variance`` function is
908 """Return the square root of the sample variance.
910 See ``variance`` for arguments and other details.
926 """Return the square root of the population variance.
1079 slope = sxy / sxx # equivalent to: covariance(x, y) / variance(x)
1200 variance = self._sigma * self._sigma
1201 if not variance:
1204 return exp(diff * diff / (-2.0 * variance)) / sqrt(tau * variance)
1260 X_var, Y_var = X.variance, Y.variance
1309 def variance(self):