A Relationship: Word Alignment, Phrase Table, and Translation Quality

Table 11

𝐶-value and 𝑃-value threshold effect on the phrase table size and BLEU scores.

Thresholds		UM-Corpus + CWMT 2013
𝐶-value 𝜀	−log(𝑃-value)𝜏𝐹	Phrase table (%)	BLEU (%)
0	0	100	28.13
10	20	83.6	28.09
25	45	52.5	27.98
100	60	29.7	28.11
200	100	14.3	28.27
400	200	2.02	25.78