# scipy.stats.mstats.hmean

scipy.stats.mstats.hmean(a, axis=0, dtype=None)

  Calculate the harmonic mean along the specified axis.

  That is: n / (1/x1 + 1/x2 + … + 1/xn)

  Parameters
    a array_like

      Input array, masked array or object that can be converted to an array.

    axis int or None, optional

      Axis along which the harmonic mean is computed. Default is 0. If None, compute over the whole array a.

    dtype dtype, optional

      Type of the returned array and of the accumulator in which the elements are summed. If dtype is not specified, it defaults to the dtype of a, unless a has an integer dtype with a precision less than that of the default platform integer. In that case, the default platform integer is used.

  Returns
    hmean ndarray

      See dtype parameter above.

  See also

  `numpy.mean`

    Arithmetic average

  `numpy.average`

    Weighted average

  `gmean`

    Geometric mean

  Notes

  The harmonic mean is computed over a single dimension of the input array, axis=0 by default, or all values in the array if axis=None. float64 intermediate and return values are used for integer inputs.

  Use masked arrays to ignore any non-finite values in the input or that arise in the calculations such as Not a Number and infinity.

  Examples

      >>> from scipy.stats import hmean
      >>> hmean([1, 4])
      1.6000000000000001
      >>> hmean([1, 2, 3, 4, 5, 6, 7])
      2.6997245179063363

scipy.stats.mstats.gmean scipy.stats.mstats.kurtosis