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