Characterization of the Systematic and Random Errors in Satellite Precipitation Using the Multiplicative Error Model
Why this work is in the frame
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Bibliographic record
Abstract
Precipitation plays a critical role in the water and energy cycle. The systematic and random errors of precipitation are usually estimated using the additive model. However, various studies have shown that the multiplicative model is more suitable to describe the errors of precipitation than the additive model. This study integrates the multiplicative model with the Willmott-AghaKouchak method to characterize the errors of four selected representative satellite precipitation products in China. Zero precipitation is addressed by adding a tiny increment, which is determined by a sensitivity analysis, enabling the examination of missed precipitation and false alarms compared with the traditional strategy that only considers hit events. The results show that the systematic errors based on the additive model are too sensitive to heavy precipitation, resulting in problems, such as unexpected fluctuations, regional biases, unsteady performance, and reverse seasonal and elevational trends in some cases. In contrast, the multiplicative model resolves these problems through balancing the contributions of light and heavy precipitation and is recommended for systematic and random error estimation.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it