ilya oparin wrote: > ppl = 10^(-logprob / (ntokens - noov + nsentences)) > ppl1 = 10^(-logprob / (ntokens - noov)) > > You can basically find info of such kind in the mailing archive on the SRILM site. > Or simply using google. Searching for "srilm ppl1" will find the mailing that explains what ppl1 is and why it can be useful. Andreas