This article presents a simple yet efficient method for solving lemma ambiguity as a part of morphological tagging of Estonian. By lemma ambiguity authors mean the situation when a word-form has several (mostly two) possible morphological readings and the only difference between these readings lies in the correct form of lemma, i.e. the POS and grammatical categories are the same, but possible lemmas are different. This type of ambiguity is characteristic of 1.5% of tokens in an otherwise morphologically disambiguated text. A text- and corpus-based method is used to disambiguate this kind of ambiguity. The precision of the method is 0.94 and recall 0.67.
IOS Press, Inc.
6751 Tepper Drive
Clifton, VA 20124
Tel.: +1 703 830 6300
Fax: +1 703 830 2300 email@example.com
(Corporate matters and books only) IOS Press c/o Accucoms US, Inc.
For North America Sales and Customer Service
West Point Commons
Lansdale PA 19446
Tel.: +1 866 855 8967
Fax: +1 215 660 5042 firstname.lastname@example.org