Translation quality statistics

This page aims to give an overview of the quality of various translators available in the Apertium platform. Word Error Rate (WER) and Position-independent Word Error Rate (PWER) are measures of post-edition effort. The number gives the expected number of words needed to be corrected in 100 words of running text. So, a WER of 4.7% indicates that in a given 100 words of text, 4.7 of them will need to be corrected by the post-editor.

Translator	Date	Version	Direction	WER	PWER	BLEU	Reference
apertium-nn-nb	12th October 2009	0.6.1	nn → nb	-	-	-
			nb → nn	-	-	-
apertium-sv-da	12th Oct 2009	0.5.0	sv → da	30.3 %	27.7 %	-	http://wiki.apertium.org/w/index.php?title=Swedish_and_Danish/Evaluation&oldid=14881
			da → sv	-	-	-
apertium-eu-es	2nd September 2009		eu → es	72.4 %	39.8 %	-	Ginestí-Rosell et al., 2009
			es → eu	-	-	-
apertium-cy-en	2nd January 2009		cy → en	55.7 %	30.5 %	-	Tyers and Donnelly, 2009
			en → cy	-	-	-
apertium-eo-en	08 May 2009	0.9.0	en → eo	21.0 %	19.0 %	-	http://wiki.apertium.org/w/index.php?title=English_and_Esperanto/Evaluation&oldid=12418
			eo → en	-	-	-
apertium-es-pt	15th May 2006		es → pt	4.7 %	-	-	Armentano et al., 2006
			pt → es	11.3 %	-	-
apertium-oc-ca	10th May 2006		oc → ca	9.6 %	-	-	Armentano and Forcada, 2006
			ca → oc	-	-	-
apertium-pt-ca	-		pt → ca	-	-	-	-
			ca → pt	-	-	-

References

• Armentano-Oller, C., Carrasco, R. C. Corbí-Bellot, A. M., Forcada, M. L., Ginestí-Rosell, M., Ortiz-Rojas, S., Pérez-Ortiz, J. A., Ramírez-Sánchez, G., Sánchez-Martínez, F., Scalco, M. A. (2006) "Open-source Portuguese-Spanish machine translation", in In Lecture Notes in Computer Science 3960 (Computational Processing of the Portuguese Language, Proceedings of the 7th International Workshop on Computational Processing of Written and Spoken Portuguese, PROPOR 2006), May 13-17, 2006, ME - RJ / Itatiaia, Rio de Janeiro, Brazil. , p. 50-59
• Armentano-Oller, C. and Forcada, M. L. (2006) "Open-source machine translation between small languages: Catalan and Aranese Occitan", in Strategies for developing machine translation for minority languages (5th SALTMIL workshop on Minority Languages) (organized in conjunction with LREC 2006 (22-28.05.2006)) , p. 51-54
• Ginestí-Rosell, M. and Ramírez-Sánchez, G. and Ortiz-Rojas, S. and Tyers, F. M. and Forcada, M. L. (2009) "Development of a free Basque to Spanish machine translation system". Procesamiento de Lenguaje Natural. No. 43, pp. 185--197
• Tyers, F. M. and Donnelly, K. (2009) "apertium-cy - a collaboratively-developed free RBMT system for Welsh to English". The Prague Bulletin of Mathematical Linguistics No. 91, pp. 57--66.