In order to create a reliable model of monthly flow rate, the value of each input factor, cumulative monthly precipitation P and the average monthly temperature T, is coded on three levels (Table 2): the lower level of the interval, as a minimum observed value (denoted as −1 in coded factor values); the higher level of the interval, as a maximum observed value (denoted as +1 in coded factor values); and the central point of the interval, as a middle between maximum and minimum observed data (denoted as 0 level in coded factor values). Coding of real factor values (i.e., their normalization) is a necessary step for comparison of the parameters’ effect on flow rate independently of their units of measurement.

Table 2

Input parameters . | Lower interval level (coded value) . | Central interval level (coded value) . | Higher interval level (coded value) . |
---|---|---|---|

P (mm) | 1.80 ( − 1) | 79.85 (0) | 157.90 ( + 1) |

T (°C) | −7.00 ( − 1) | 8.9 (0) | 24.80 ( + 1) |

Input parameters . | Lower interval level (coded value) . | Central interval level (coded value) . | Higher interval level (coded value) . |
---|---|---|---|

P (mm) | 1.80 ( − 1) | 79.85 (0) | 157.90 ( + 1) |

T (°C) | −7.00 ( − 1) | 8.9 (0) | 24.80 ( + 1) |

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