Spatial distribution of mountain pine beetle in the Morice Timber Supply Area in western British Columbia between 1995--2002
Bibliographic record
Abstract
Mountain pine beetle (MPB, Dendroctonus ponderosae) outbreaks are spreading at an unprecedented rate in British Columbia. To better understand which factors prevail in the spatial distribution of MPB, infestation data in the Morice Timber Supply Area (Western British Columbia) from 1995 to 2002 were analyzed using classification and regression trees (CART) modeling. The MPB occurrence in a given year was associated with between 2.5 and 5.5 beetle infested cells in a previous year (in 9 cells analysis window), elevation between 700 and 1000 m, stands where pine is a dominating or secondary species, stand age between 120 and 200 years, relatively warm falls, springs and winters, and high average annual precipitation. Despite many uncertainties stemming mainly from the quality of the data, the CART method proved to be useful in analyzing and explaining the hierarchical relationships between dependent and independent variables used this research.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".