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. 2016 Jul 1;95(26):e3929. doi: 10.1097/MD.0000000000003929

Figure 4.

Figure 4

Autocorrelation functions (ACF) and partial autocorrelation functions (PACF) of model residuals at different nonseasonal and seasonal differencing for monthly influenza incidence from January 2004 to December 2011 in the Hebei Province: (A) nonseasonal difference = 0, seasonal difference = 0; (B) nonseasonal difference = 0, seasonal difference = 1; (C) nonseasonal difference = 1, seasonal difference = 0; (D) nonseasonal difference = 1, seasonal difference = 1.ACF, autocorrelation functions, PACF = partial autocorrelation functions.