CDT computes several statistics to evaluate the performance of merged data performed with CDT, satellite rainfall estimates products and the output of climate models, and to evaluate the skill of a specific methods or parameters used for the bias adjustment or the merging. These statistics can be classified into 3 groups: continuous, categorical and volumetric. The following table shows the list of all computed statistics.
| Abbreviation Name | Long Name | Perfect Score | Statistics Group | Documentation |
|---|---|---|---|---|
| CORR | Correlation | 1 | Continuous | Forecast verification |
| BR2 | Coefficient of determination (R2) multiplied by the regression slope | 1 | Continuous | Package hydroGOF |
| BIAS | Bias | 1 | Continuous | Forecast verification |
| PBIAS | Percent Bias | 0 | Continuous | Forecast verification |
| ME | Mean Error | 0 | Continuous | Forecast verification |
| MAE | Mean Absolute Error | 0 | Continuous | Forecast verification |
| RMSE | Root Mean Square Error | 0 | Continuous | Forecast verification |
| NSE | Nash-Sutcliffe Efficiency | 1 | Continuous | Forecast verification |
| MNSE | Modified Nash-Sutcliffe efficiency | 1 | Continuous | Package hydroGOF |
| RNSE | Relative Nash-Sutcliffe efficiency | 1 | Continuous | Package hydroGOF |
| IOA | Index of Agreement | 1 | Continuous | Package hydroGOF |
| MIOA | Modified index of agreement | 1 | Continuous | Package hydroGOF |
| RIOA | Relative Index of Agreement | 1 | Continuous | Package hydroGOF |
| POD | Probability Of Detection | 1 | Categorical | Forecast verification |
| POFD | Probability Of False Detection | 0 | Categorical | Forecast verification |
| FAR | False Alarm Ratio | 0 | Categorical | Forecast verification |
| FBS | Frequency Bias (Bias score) | 1 | Categorical | Forecast verification |
| CSI | Critical Success Index | 1 | Categorical | Forecast verification |
| HSS | Heidke Skill Score | 1 | Categorical | Forecast verification |
| MQB | Mean Quantile Bias | 1 | Volumetric | (Aghakouchak et al., 2011) and (Aghakouchak & Mehran, 2013) |
| MQE | Mean Quantile Error | 0 | Volumetric | (Aghakouchak et al., 2011) and (Aghakouchak & Mehran, 2013) |
| VHI | Volumetric Hit Index | 1 | Volumetric | (Aghakouchak et al., 2011) and (Aghakouchak & Mehran, 2013) |
| QPOD | Quantile Probability of Detection | 1 | Volumetric | (Aghakouchak et al., 2011) and (Aghakouchak & Mehran, 2013) |
| VFAR | Volumetric False Alarm Ratio | 0 | Volumetric | (Aghakouchak et al., 2011) and (Aghakouchak & Mehran, 2013) |
| QFAR | Quantile False Alarm Ratio | 0 | Volumetric | (Aghakouchak et al., 2011) and (Aghakouchak & Mehran, 2013) |
| VMI | Volumetric Miss Index | 0 | Volumetric | (Aghakouchak et al., 2011) and (Aghakouchak & Mehran, 2013) |
| QMISS | Quantile Miss Index | 0 | Volumetric | (Aghakouchak et al., 2011) and (Aghakouchak & Mehran, 2013) |
| VCSI | Volumetric Critical Success Index | 1 | Volumetric | (Aghakouchak et al., 2011) and (Aghakouchak & Mehran, 2013) |
| QCSI | Quantile Critical Success Index | 1 | Volumetric | (Aghakouchak et al., 2011) and (Aghakouchak & Mehran, 2013) |
References:
AghaKouchak, A., Behrangi , A., Sorooshian , S., Hsu , K., and Amitai , E. (2011): Evaluation of satellite-retrieved extreme precipitation rates across the Central United States. Journal of Geophysical Research, 116, D02115, doi:10.1029/2010JD014741.
AghaKouchak, A., and Mehran , A. (2013): Extended Contingency Table: Performance Metrics for Satellite Observations and Model Simulations. Water Resources Research, doi:10.1002/wrcr.20498.