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Order of integration : ウィキペディア英語版 | Order of integration
Order of integration, denoted ''I''(''d''), is a summary statistic for a time series. It reports the minimum number of differences required to obtain a covariance stationary series. == Integration of order zero == A time series is integrated of order 0 if it admits a moving average representation with : where is the possibly infinite vector of moving average weights (coefficients or parameters). This implies that the autocovariance is decaying to 0 sufficiently quickly. This is a necessary, but not sufficient condition for a stationary process. Therefore, all stationary processes are I(0), but not all I(0) processes are stationary.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Order of integration」の詳細全文を読む
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