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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.).