Investigating and optimizing score dependability of a local ITA speaking test across language groups: A generalizability theory approach
Why this work is in the frame
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Bibliographic record
Abstract
With the present study I investigated the sources of score variance and dependability in a local oral English proficiency test for potential international teaching assistants (ITAs) across four first language (L1) groups, and suggested alternative test designs. Using generalizability theory, I examined the relative importance of L1s (i.e., Indian, Korean, Mandarin, and Spanish), examinees, tasks, and ratings to score variability, and estimated dependability across the L1s. The analyses identified examinees as the largest contributor, which is important for high dependability and validity arguments for test scores. Effects of ratings and tasks were small, but L1 effects on score variance were considerable, with the Indian group’s dependability lowest. Unlike previous generalizability theory studies on L1 effects, however, further analyses revealed that the L1 effects highly likely reflect proficiency differences rather than strong bias when comparing the percent agreement of the ratings, external criteria of examinee English proficiency, and underlying score distributions. I discuss the proficiency differences related to varied socio-linguistic contexts of using and learning English. Lastly, I suggest an alternative design with fewer items and one additional rating for improved dependability. Considering multiple test purposes specific to ITA testing (i.e., efficiency, construct representation, formative advantages), I propose a flexible approach.
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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 | 0.003 | 0.007 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| 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