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Table 6 False alarm rates for OOV words when using Kaldi-based ASR with N-gram LM

From: Dynamic out-of-vocabulary word registration to language model for speech recognition

  Position Freq. 2 mora 3 mora 4 mora 5 mora
ONE 0 0 0 0
ALL .011 .008 0 0
500r Random 500 .005 .012 .002 0
1kr Random 1000 .019 .011 .004 .001
2kr Random 2000 .019 .008 .004 .002
5kr Random 5000 .032 .011 .003 .004
500c POS 500 .009 .008 .002 .001
1kc POS 1000 .009 .008 .002 .001
2kc POS 2000 .015 .008 .002 .001
5kc POS 5000 .038 .013 .002 .002