Comparison of air exchange rates measured with different methods and influencing factors: preliminary results of a field study involving asthmatic children
Bibliographic record
Abstract
Two tracer gas methods were used to measure ventilation rates in a field study that involves characterizing ventilation and indoor air quality in 115 homes with asthmatic children. The perfluorocarbon tracer gas (PFT) based measurement was 7-day average and reflected the effects of occupant behaviors, while sulphur hexafluoride (SF6) based method was a short-term measurement with occupant influences minimized. A subset of data involving 70 homes was analyzed to determine the most influential factors associated with each method. The explanatory variables including building characteristics and occupant behaviours were collected using questionnaires. The median of the air exchange rates (AERs) during winter in the child's bedroom was 0.28 h-1 (SF6 decay) and 0.21 h-1 (PFT technique). The difference was observed to be statistically significant. The most significant explanatory variables were year of construction for SF6-basesed AERs and frequency of child's bedroom window opening during the 7-day period for the PFT-based AERs.
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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 | 0.003 | 0.005 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| 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 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".