Question

Based on correlogram, write down MA(q) or AR(p) model.

Based on correlogram, write down MA(q) or AR(p) model.

correlogram:

In time series analysis, a correlogram, also known as an autocorrelation plot, is a plot of the sample autocorrelations versus (the time lags). If cross-correlation is used, the result is called a cross-correlogram

Based on correlogram,

Ma Model :

MA model. For many time series the first difference is often sufficient to render a series stationary.

A simple mechanism to determine whether a series is non-stationary relates to mean reversion so series that trend do not mean revert and are normally non-stationary.

While series that criss-cross the mean value are generally stationary.

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