The unweighted sample variance of the data array.
Returns a scalar cf.Data object.
f.var() is equivalent to f.data.var(ddof=1, squeeze=True).
See also
cf.Data.var, max, mean, mid_range, min, range, sample_size, sd, sum
>>> f.var() <CF Data: 1187.285 hPa2>
cf.Field.unsqueeze
cf.Field.weights
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