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Table 2 Results of the Ljung-Box test for autocorrelation in the residual time series after removal of calendar effects and trend

From: Potential for early warning of viral influenza activity in the community by monitoring clinical diagnoses of influenza in hospital emergency departments

  

Ljung-Box Test

Year

Time series

Q-statistic

P-value

2001

ED

11.72

0.07

 

Laboratory model

8.29

0.22

2002

ED

14.60

0.02*

 

Laboratory

5.26

0.51

2003

ED

4.36

0.63

 

Laboratory

6.16

0.41

2004

ED

3.25

0.78

 

Laboratory

4.25

0.64

2005

ED

3.25

0.78

 

Laboratory

13.71

0.03*

2001 to 2005

ED

11.72

0.16

 

Laboratory

13.58

0.09

  1. * Indicates presence of statistically significant autocorrelation in the residual series.