Bayesian Unit-Root Testing in Stochastic Volatility Models
随机波动率模型中的贝叶斯单位根检验AI 解读 ↓
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随机波动率模型中的贝叶斯单位根检验AI 解读 ↓
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This article uses a Bayesian unit-root test in stochastic volatility models. The time series of interest is the volatility that is unobservable. The unit-root testing is based on the posterior odds ratio, which is approximated by Markov-chain Monte Carlo methods. Simulations show that the testing procedure is efficient for moderate sample size. The unit-root hypothesis is rejected in seven market indexes, and some evidence of nonstationarity is observed in the TWSI of Taiwan.
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