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Table 1

GP settings used for runoff forecasting

OptionSetting
Independent runs 100 
Individuals in one generation 500 
Maximum generations 100 
Method of initialization Ramped half and half 
Function set +, −, /, *, sin, tan, ln, exp, sqrt 
Constant range – Min/Max −10/10 
Tree depth – Initial/Max 3/7 
Method of selection Tournament (Size = 4) 
Probability of crossover 0.7 
Mutation probabilities
Constant//Tree/Node/Separation 
0.5/0.5/0.3/0.3 
OptionSetting
Independent runs 100 
Individuals in one generation 500 
Maximum generations 100 
Method of initialization Ramped half and half 
Function set +, −, /, *, sin, tan, ln, exp, sqrt 
Constant range – Min/Max −10/10 
Tree depth – Initial/Max 3/7 
Method of selection Tournament (Size = 4) 
Probability of crossover 0.7 
Mutation probabilities
Constant//Tree/Node/Separation 
0.5/0.5/0.3/0.3 
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