Table 3 Optimal marginal distribution functions for drought characteristic variables.
Drought type | Drought variable | RMSE | Optimal distribution | ||||||
|---|---|---|---|---|---|---|---|---|---|
normal | LogN | Gam | GEV | Rl | Wb | Exp | |||
Meteorological drought | Duration | 0.089 | 0.062 | 0.062 | 0.081 | 0.178 | 0.059 | 0.053 | Exp |
Severity | 0.102 | 0.061 | 0.046 | 0.081 | 0.134 | 0.048 | 0.087 | Gam | |
Area | 0.058 | 0.096 | 0.081 | 0.067 | 0.099 | 0.077 | 0.085 | normal | |
Agricultural drought | Duration | 0.115 | 0.122 | 0.116 | 0.228 | 0.232 | 0.114 | 0.134 | Wb |
Severity | 0.123 | 0.082 | 0.078 | 0.093 | 0.277 | 0.085 | 0.191 | Gam | |
Area | 0.125 | 0.061 | 0.074 | 0.062 | 0.275 | 0.066 | 0.116 | LogN | |