Tests for longitudinal change in skewed samples with application to Hibernia sediment chemistry data
Bibliographic record
Abstract
The Hibernia platform began drilling for oil on November 17th, 1997 in the Atlantic Ocean off the coast of Newfoundland. Measurements of organic and inorganic chemicals occurred in both 1995 and 1998 to determine if this drilling process resulted in a significant sediment change In the ocean floor surrounding the drill site. Statistical analysis and summary of the change in sediment chemistry data collected from the Hibernia Gravity Based Structure (GBS) were released in 1999 by Jacques Whitford Environment Ltd. St. John's, Newfoundland. The objective of this practicum is to more thoroughly examine these data collected before and after the Hibernia drilling process began and to determine whether the introduction of the GBS platform resulted in changes in the concentration of various chemicals in the surrounding sediment. This procedure involved the modification of existing statistical tests to accommodate for the asymmetrical nature of the data as well as existing longitudinal and spatial correlations. Combined data test results of this practicum do not in fact differ significantly from those reported in 1999 by Jacques Whitford Environment Ltd.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.086 | 0.221 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.003 |
| Bibliometrics | 0.005 | 0.006 |
| Science and technology studies | 0.002 | 0.004 |
| Scholarly communication | 0.002 | 0.003 |
| Open science | 0.003 | 0.002 |
| Research integrity | 0.002 | 0.004 |
| Insufficient payload (model declined to judge) | 0.010 | 0.002 |
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".