Minimum Hellinger distance estimation for a semiparametric location-shifted mixture model
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Bibliographic record
Abstract
In this article, we propose a minimum Hellinger distance estimation (MHDE) for a semiparametric two-component mixture model where the two components are unknown location-shifted symmetric distributions f(x−μ1) and f(x−μ2). In the construction of MHDE, an appropriate estimation of the unknown nuisance parameter f is required. We propose to use the inversion formula given in Bordes et al. to estimate f based on current available sample from the mixture. To obtain the MHDE, an algorithm is presented to ease the numerical calculation. We also propose a simple but intuitive and robust initial estimator of the parameters. To assess its performance, we carry out a simulation study with comparison with a minimum profile Hellinger distance estimator (MPHDE) given in Wu et al. We use the proposed estimator to analyse the Old Faithful Geyser data in order to demonstrate its application. Through the numerical studies, we observe that our proposed MHDE for this semiparametric mixture model inherits the desired robustness and efficiency properties of that for parametric models. The proposed MHDE is very competitive with the MPHDE when there is no data contamination, whereas it performs better than the MPHDE in terms of bias when data is contaminated with outliers. Moreover, the MHDE reduces significantly the computing time of the MPHDE.
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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 | 0.001 | 0.001 |
| 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