test whether variance is the same in 2 subsamples
Parameters: | y : array_like
x : array_like
idx : integer
split : None or integer or float in intervall (0,1)
drop : None, float or int
alternative : string, ‘increasing’, ‘decreasing’ or ‘two-sided’
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Returns: | (fval, pval) or res : fval : float
pval : float
res : instance of result class
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Notes
The Null hypothesis is that the variance in the two sub-samples are the same. The alternative hypothesis, can be increasing, i.e. the variance in the second sample is larger than in the first, or decreasing or two-sided.
Results are identical R, but the drop option is defined differently. (sorting by idx not tested yet)
Methods
run(y, x[, idx, split, drop, alternative, ...]) | see class docstring |