test for model stability, breaks in parameters for ols, Hansen 1992
Parameters : | olsresults : instance of RegressionResults
skip : int or None
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Returns : | teststat : float
crit : structured array
pvalue Not yet : ft, s : arrays
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Notes
looks good in example, maybe not very powerful for small changes in parameters
According to Greene, distribution of test statistics depends on nvar but not on nobs.
References
Greene section 7.5.1, notation follows Greene