Abstract
This article discusses large sample inference problems for a first-order ARCH(1) process where threshold appears not only in the mean but also in the variance function. Geometric ergodicity of the process is discussed. Least-squares estimators of parameters are derived and relevant limit results are obtained. Also, the uniform local asymptotic normality of the log-likelihood ratio and a class of efficient estimators are briefly discussed. The model is applied to Korean financial time series.
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