Predicting the Proficiency Level of Nonnative Hebrew Authors
What it is about
The authors use the Hebrew Essay Corpus (4000 essays: native speakers and learners with Arabic, French and Russian as L1) to predict three things with XGBoost on about 2300 hand-chosen features, not deep models: whether the author is a native speaker, the author's L1, and the essay's proficiency score. Native versus non-native gets 99% accuracy (six errors in 800 test essays). L1 identification gets 77%. Score prediction gives a mean absolute error of 1.67 points against 1.90 for a median baseline, and the two human raters differ by 2.52 points. The strongest features are text length, lexical richness (root type-token ratio), median word rank, and letter and affix counts; SHAP is used to read them. For Arabic learners, high mean sentence length and overuse of the conjunctive ו stand out. For Russian learners, underuse of the definite article ה is the strongest sign.
Ideas
- I1. A transparent L1-transfer detector: count the Hebrew letter pairs that are homophones (for example ח and כ) and the word-final letter forms, and report which ones the learner over- or underuses. Each rule is then explainable, as Mova requires.
- I2. Rank-quantile features (word counts in five logarithmic frequency bins from a Wikipedia list) give a cheap, deterministic proficiency measure. Build one for Mova from
treebanks/heand check it on the paper's per-essay ordering. - I3. The human inter-rater gap (2.52 points) is larger than the model's error (1.67). Any Mova score for learner text should be reported with the same baseline and the same kind of agreement measure.
For Mova
I1 is a rule table for 2. Script and spelling (homophone and final-form letters) and for the transfer notes in 10. Historical layers: Biblical, Mishnaic, Medieval and Modern Hebrew. I2 is a feature for 8. Lexicon and register once the Modern Hebrew reader exists (12. Mova and Modern Hebrew: where it stands, what it would need). I3 is a reporting rule for any measurement; the data itself is NC and is used only for tests.
Cite
@inproceedings{nguyen2022predicting,
title = {{Predicting the Proficiency Level of Nonnative Hebrew Authors}},
author = {Nguyen, Isabelle and Wintner, Shuly},
booktitle = {Proceedings of the Thirteenth Language Resources and Evaluation Conference},
year = {2022},
url = {https://aclanthology.org/2022.lrec-1.573/}
}References
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