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. 2015 Mar 11;10(3):e0116832. doi: 10.1371/journal.pone.0116832

Fig 4. Histogram-Normality test of residual series of the ARIMA (1, 1, 2) (1, 1, 1)12 model.

Fig 4

Skewness is not 0, Kurtosis is more than 3, Probability is 0.000000, all that suggest the residual series do not obey normal distribution and obey heavier-tailed distribution.