same as used in
    the call to this var function.

    .. versionadded:: 2.0.0

correction : {int, float}, optional
    Array API compatible name for the ``ddof`` parameter. Only one of them
    can be provided at the same time.

    .. versionadded:: 2.0.0

Returns
-------
variance : ndarray, see dtype parameter above
    If `out` is None, return a new array containing the variance,
    otherwise return a reference to the output array. If ddof is >= the
    number of non-NaN elements in a slice or the slice contains only
    NaNs, then the result for that slice is NaN.

See Also
--------
std : Standard deviation
mean : Average
var : Variance while not ignoring NaNs
nanstd, nanmean
:ref:`ufuncs-output-type`

Notes
-----
The variance is the average of the squared deviations from the mean,
i.e.,  ``var = mean(abs(x - x.mean())**2)``.

The mean is normally calculated as ``x.sum() / N``, where ``N = len(x)``.
If, however, `ddof` is specified, the divisor ``N - ddof`` is used
instead.  In standard statistical practice, ``ddof=1`` provides an
unbiased estimator of the variance of a hypothetical infinite
population.  ``ddof=0`` provides a maximum likelihood estimate of the
variance for normally distributed variables.

Note that for complex numbers, the absolute value is taken before
squaring, so that the result is always real and nonnegative.

For floating-point input, the variance is computed using the same
precision the input has.  Depending on the input data, this can cause
the results to be inaccurate, especially for `float32` (see example
below).  Specifying a higher-accuracy accumulator using the ``dtype``
keyword can alleviate this issue.

For this function to work on sub-classes of ndarray, they must define
`sum` with the kwarg `keepdims`

Examples
--------
>>> import numpy as np
>>> a = np.array([[1, np.nan], [3, 4]])
>>> np.nanvar(a)
1.5555555555555554
>>> np.nanvar(a, axis=0)
array([1.,  0.])
>>> np.nanvar(a, axis=1)
array([0.,  0.25])  # may vary

r