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STAR model : ウィキペディア英語版
STAR model

In statistics, Smooth Transition Autoregressive (STAR) models are typically applied to time series data as an extension of autoregressive models, in order to allow for higher degree of flexibility in model parameters through a smooth transition.
Given a time series of data ''x''''t'', the STAR model is a tool for understanding and, perhaps, predicting future values in this series, assuming that the behaviour of the series changes depending on the value of the transition variable. The transition might depend on the past values of the ''x'' series (similar to the SETAR models), or exogenous variables.
The model consists of ''2'' autoregressive (AR) parts linked by the transition function. The model is usually referred to as the STAR(''p'') models proceeded by the letter describing the transition function (see below) and ''p'' is the order of the autoregressive part. Most popular transition function include exponential function and first and second-order logistic functions. They give rise to Logistic STAR (LSTAR) and Exponential STAR (ESTAR) models.
==Definition==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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