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Table 2 Cross correlation coefficients between the Intego and EISS network at different lags for acute respiratory infections and influenza like illness

From: Computerized general practice based networks yield comparable performance with sentinel data in monitoring epidemiological time-course of influenza-like illness and acute respiratory illness

 

Lag (cross-correlation)*

 

ILI

ARI

Original series

  

1999-2000

0 (0.96)/1 (0.94)

0 (0.84)/1 (0.86)

2000-2001

0 (0.80)/1 (0.82)

0 (0.65)/-1 (0.63)

2001-2002

0 (0.89)/-1 (0.92)

0 (0.77)/1 (0.77)

2002-2003

0 (0.92/-1 (0.88)

0 (0.82)/-1 (0.79)

Differenced series (lag 1)

  

1999-2000

0 (0.71)/1 (0.61)

1 (0.41)

2000-2001

3 (0.37)

7 (0.35)

2001-2002

0 (0.71)/-1 (0.81)

-7 (0.49)

2002-2003

0 (0.73)

0 (0.44)

  1. * (, for s = -L to L, where L is the number of lags.).