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Table 3 Relative frequency (RF%) of fire causes inside clusters and the ratio compared with the fire causes outside clusters for the same frame-period

From: Cluster recognition in spatial-temporal sequences: the case of forest fires

Study period Cluster Arson Private Unknown Lightning
RF (%) Ratio RF (%) Ratio RF (%) Ratio RF (%) Ratio
1969–1978 1 0.0 0.0 85.7 1.4 14.3 0.5 0.0
2 0.0 0.0 66.7 1.4 33.3 1.0 0.0
1979–1990 1 60.0 2.3 30.0 1.0 10.0 0.3 0.0
2 33.3 1.9 52.4 1.5 14.3 0.5 0.0
3 37.5 0.8 0.0 0.0 62.5 3.0 0.0
4 0.0 0.0 0.0 0.0 75.0 2.3 25.0 5.5
1991–2008 1 100.0 a 0.0 0.0 0.0 0.0
2 100.0 8.6 0.0 0.00 0.0 0.0 0.0
3 0.0 0.0 33.3 1.6 16.7 1.0 0.0 0.0
4 0.0 0.0 50. 1.6 0.0 0.0 0.0
  1. ano arson outside the cluster