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This article describes the current state of syntactic analysis of Estonian using Constraint Grammar. Constraint Grammar framework divides parsing into two different modules: morphological disambiguation and determination of syntactic functions. This article focuses on the last module in detail. If the morphological disambiguator achieves the precision more than 85% and error rate is smaller than 2% then 80-88% of words becomes syntactically unambiguous. | Proceedings of EACL 99 Determination of Syntactic Functions in Estonian Constraint Grammar Kaili Muurisep Institute of Computer Science University of Tartu Liivi 2 50409 Tartu Estonia kaili@ut.ee Abstract This article describes the current state of syntactic analysis of Estonian using Constraint Grammar. Constraint Grammar framework divides parsing into two different modules morphological disambiguation and determination of syntactic functions. This article focuses on the last module in detail. If the morphological disambiguator achieves the precision more than 85 and error rate is smaller than 2 then 80-88 of words becomes syntactically unambiguous. The error rate of parser is 1-4 depending on the ambiguity rate of input. The main goal of this work is to elaborate an efficient parser for Estonian and annotate the Corpus of Estonian Written Texts syntactically. It is the first attempt to write a parser for Estonian. 1 Introduction The main idea of the Constraint Grammar Karlsson 1990 is that it determines the surface-level syntactic analysis of the text which has gone through prior morphological analysis. The process of syntactic analysis consists of three stages morphological disambiguation identification of clause boundaries and identification of syntactic functions of words. This article focuses on the last module in detail. Grammatical features of words are presented in the forms of tags which are attached to words. The tags indicate the inflectional and derivational properties of the word and the word class membership the tags attached during the last stage of the analysis indicate its syntactic functions. The underlying principle in determining both the morphological interpretation and the syntactic functions is the same first all the possible labels are attached to words and then the ones that do not fit the context are removed by applying special rules or constraints. Constraint Grammar consists of hand written rules which by checking the context decide .
