The influence of volatility and endogeneity in economic time series on cointegration analysis

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This research investigated the influence of heteroskedastic variances and endogeneity on cointegration analysis. We demonstrated that a variance ratio cointegration test yields reasonable empirical sizes under most cases of heteroskedastic variances and endogeneity, as compared to other tests including standard cointegration tests. While the cointegration test with threshold adjustment has size distortions under heteroskedastic variances and endogeneity, it generally has better power performance under most cointegration relationships with nonlinearity.