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)
retres : boolean
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Returns : | (fval, pval) or res : fval : float
pval : float
res : instance of result class
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Notes
TODO: add resultinstance - DONE maybe add drop-middle as option maybe allow for several breaks
can do Chow test for structural break in same way
ran sanity check