若是只有一個變量,而其為定態的話,請參考 "Inference in TAR models." Studies in Nonlinear Dynamics and Econometrics, (1997);若其為非定態的話,請參考 "Threshold Autoregression with a Unit Root." Econometrica (2001)。
若有多個變量,而其為定態的話,請參考 "Sample splitting and threshold estimation." Econometrica, (2000);若其為非定態的話,請參考 "Testing for two-regime threshold cointegration in vector error correction models,"。