Unsupervised Morpheme Analysis -- Morpho Challenge 2009

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Competition 2: German

**Table:** The obtained average precision (AP%) in the information retrieval task for the submitted segmentations in **German**. Methods without authors are reference methods by the organizers. Indexing is performed using Okapi (BM25) weighting for all morphemes except the most common ones (stoplist) with frequency higher than 150,000. Asterisk (*) denotes submissions that did not include segmentations for Competition 2 and were evaluated by using the smaller Competition 1 wordlist
AUTHOR	METHOD	AP%
-	TWOL first	0.4885
-	TWOL all	0.4743
-	Morfessor Baseline	0.4656
-	Morfessor CatMAP	0.4642
Monson et al.	ParaMor-Morfessor Mimic	0.4490
Monson et al.	ParaMor-Morfessor Union	0.4478
Virpioja & Kohonen	Allomorfessor	0.4388
Can & Manandhar	1	0.4006*
Lavellée & Langlais	RALI-COF	0.3965*
Can & Manandhar	2	0.3952*
-	snowball german	0.3865
Lignos et al.	-	0.3863*
Monson et al.	ParaMor Mimic	0.3757
Tchoukalov et al.	MetaMorph	0.3752*
Spiegler et al.	PROMODES committee	0.3634*
-	dummy	0.3509
Golénia et al.	UNGRADE	0.3496*
Spiegler et al.	PROMODES	0.3484*
-	grammatical first	0.3353
Lavellée & Langlais	RALI-ANA	0.3284*
Bernhard	MorphoNet	0.3167
-	grammatical all	0.3014
Spiegler et al.	PROMODES 2	0.2997*

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