7.10.1.15. statsmodels.stats.diagnostic.breaks_hansen¶

statsmodels.stats.diagnostic.breaks_hansen(olsresults)[source]¶

test for model stability, breaks in parameters for ols, Hansen 1992

Parameters:	olsresults : instance of RegressionResults uses only endog and exog
Returns:	teststat : float Hansen’s test statistic crit : structured array critical values at alpha=0.95 for different nvars pvalue Not yet ft, s : arrays temporary return for debugging, will be removed

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.

Test statistic is verified against R:strucchange

References

Greene section 7.5.1, notation follows Greene