DanProof: Pedagogical Spell and Grammar Checking for Danish

This paper presents a Constraint Grammarbased pedagogical proofing tool for Danish. The system recognizes not only spelling errors, but also grammatical errors in otherwise correctly spelled words, and categorizes errors for WORD-integrated pedagogical comments. Possible spelling corrections are prioritized from context, and grammatical corrections generated by a morphological module. The system uses both phonetic similarity measures and traditional Levenshtein-distances, and has a special focus on compounding/splitting errors common in modern Danish. As a classical spell-checker DanProof achieves F-Scores over 95, and F=88 if compounding correction is included. With the maximal set of error types, 2/3 of all errors are found in school essays, and precision is 91.7%.