Unsupervised Morpheme Analysis -- Morpho Challenge 2007

Competition 2: German

**Table:** The obtained average precision (AP%) in the information retrieval task for the submitted segmentations in **German** (Competition 2 participants in bold and reference methods in normal font). Indexing is performed using Tfidf (BM25) weighting for all morphemes (left) and Okapi (BM25) weighting for all morphemes except the most common ones (stoplist) with frequency higher than 150,000 (right).
Tfidf BM25 weighting for all morphemes			Okapi BM25 weighting and 150,000 stoplist
METHOD	WORDLIST	AP%	METHOD	WORDLIST	AP%
morfessor baseline	withnew	0.3874	Bernhard 1	withnew	0.4729
morfessor baseline	withoutnew	0.3826	Bernhard 2	withoutnew	0.4676
Bernhard 1	withoutnew	0.3777	Bernhard 2	withnew	0.4625
Bernhard 2	withoutnew	0.3731	Bernhard 1	withoutnew	0.4611
porter	withnew	0.3725	Monson morfessor	withnew	0.4602
Bernhard 1	withnew	0.3720	morfessor catmap	withnew	0.4571
Bernhard 2	withnew	0.3703	morfessor baseline	withnew	0.4486
Monson morfessor	withnew	0.3520	Monson morfessor	withoutnew	0.4481
Monson morfessor	withoutnew	0.3502	morfessor catmap	withoutnew	0.4447
dummy	withnew	0.3496	morfessor baseline	withoutnew	0.4417
Bordag 5a	withnew	0.3496	Bordag 5	withnew	0.4308
morfessor catmap	withoutnew	0.3480	Bordag 5	withoutnew	0.4303
McNamee 5	withoutnew	0.3442	Bordag 5a	withnew	0.4259
morfessor catmap	withnew	0.3397	Bordag 5a	withoutnew	0.4257
McNamee 5	withnew	0.3327	Monson paramor-m.	withnew	0.4012
Bordag 5	withoutnew	0.3273	Monson paramor-m.	withoutnew	0.3989
grammatical first	withoutnew	0.3223	porter	withnew	0.3866
Monson paramor-m.	withnew	0.3200	McNamee 5	withoutnew	0.3617
grammatical first	withnew	0.3196	McNamee 5	withnew	0.3527
Monson paramor-m.	withoutnew	0.3184	grammatical first	withoutnew	0.3467
Bordag 5	withnew	0.3156	McNamee 4	withoutnew	0.3453
grammatical all	withnew	0.3128	grammatical first	withnew	0.3445
grammatical all	withoutnew	0.3126	McNamee 4	withnew	0.3351
McNamee 4	withoutnew	0.3091	Monson paramor	withnew	0.3241
McNamee 4	withnew	0.3049	dummy	withnew	0.3228
Monson paramor	withnew	0.2887	Monson paramor	withoutnew	0.3224
Monson paramor	withoutnew	0.2861	grammatical all	withnew	0.3004
Zeman	withoutnew	0.2828	McNamee 3	withoutnew	0.2953
McNamee 3	withoutnew	0.2023	grammatical all	withoutnew	0.2926
McNamee 3	withnew	0.1945	McNamee 3	withnew	0.2868
			Zeman	withoutnew	0.2568

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