Partial Autocorrelation Function
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Partial Autocorrelation Function

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High Quality Content by WIKIPEDIA articles! In time series analysis, the partial autocorrelation function (PACF) plays an important role in data analyses aimed at identifying the extent of the lag in an autoregressive model. The use of this function was introduced as part of the Box-Jenkins approach to time series modelling, where by plotting the partial autocorrelative functions one could determine the appropriate lags p in an AR(p) model or in an extended ARIMA(p,d,q) model. Given a time series zt, the partial autocorrelation of lag k is the autocorrelation between zt and zt + k with the lin...