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AI 根据所提供的论文材料归类:摘要明确提出二元结果的平滑转换 logit,并研究潜在指数的结构变化及内生变化时点,对应离散选择与结构变化。

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关注这篇论文的作者
A. Stan Hurn
Timo Teräsvirta

电力市场放松管制影响的平滑转换 Logit 模型

研究问题
电力市场放松管制后,异常高现货电价的出现规律是否发生渐进结构变化,且变化时点能否由模型内生确定?
方法与思路
作者提出平滑转换 logit,以二元结果的潜在指数刻画渐进变化,推导极大似然估计的渐近性质及线性原假设的 LM 检验。
材料陈述的贡献
摘要称昆士兰电力市场价格事件存在结构变化,估计的变化时点与放松管制进程一致,并提供相应模型与检验方法。
阅读关注点
重点核对转换函数及其识别、线性检验的适用条件、异常高价事件的定义,以及模型如何确定变化时点与渐进程度。
阅读边界
变化时点一致不足以证明放松管制的因果作用;摘要未说明其他同期变化如何处理,也未给出效应大小或检验细节。

原文摘要

This paper introduces the smooth transition logit (STL) model that is designed to detect and model situations in which there is structural change in the behaviour underlying the latent index from which the binary dependent variable is constructed. The maximum likelihood estimators of the parameters of the model are derived along with their asymptotic properties, together with a Lagrange multiplier test of the null hypothesis of linearity in the underlying latent index. The development of the STL model is motivated by the desire to assess the impact of deregulation in the Queensland electricity market and ascertain whether increased competition has resulted in significant changes in the behaviour of the spot price of electricity, specifically with respect to the occurrence of periodic abnormally high prices. The model allows the timing of any change to be endogenously determined and also market participants' behaviour to change gradually over time. The main results provide clear evidence in support of a structural change in the nature of price events, and the endogenously determined timing of the change is consistent with the process of deregulation in Queensland. Copyright © 2015 John Wiley & Sons, Ltd.

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