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Table 2 Pearson’s correlation coefficient between neural network-predicted and observed percentage of sanitary felling due to Ips typographus infestation relative to total volume of spruce in a stand calculated for training, testing and validation data sets

From: Persisting bark beetle outbreak indicates the unsustainability of secondary Norway spruce forests: case study from Central Europe

Year

Training

Testing

Validation

1998

0.55

0.40

0.52

1999

0.61

0.44

0.49

2000

0.42

0.27

0.51

2001

0.38

0.37

0.25

2002

0.44

0.48

0.21

2003

0.27

0.38

0.30

2004

0.26

0.45

0.28

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Annals of Forest Science

ISSN: 1297-966X