Several people have commented, both publicly and privately, on the Probability library I mentioned last week. There is now a new version http://biology.nmsu.edu/software/probability/ that addresses most of the concerns. In what follows I will address the salient points as I see them. - The main documentation page now begins with a brief definition of probability and likelihood. - Runtime costs have now been quantified in a fairly simple manner. The results are summarized on the main page, but indicate that there is less than a 0.5% effect in a test involving a large fraction of operations on these quantities. Is suspect this is well within the noise, but input from those with greater benchmarking experience is welcome. - Additive operators are now provided within the log domain. This completes the full set of arithmetic operators. - A suggestion was made to combine this with the math toolkit (and possibly the units) library. I hesitate to do this immediately until it is clear that the Probability library is indeed acceptable. It seems that the process would occur in stages: handle this one on its own, then work on integration if that is generally a desirable direction. This should stand on its own merits, at least initially. - Another suggestion focused on the potential for a numerical value type for the log domain, independent of probabilities. Clearly, that is contained within this and such a type could be extracted out for independent use. Had such a type existed, a portion of this library would have been simpler. However, such a type will not address the interconversions between probabilities and likelihoods that form a natural part of much statistical modeling. Thus, the higher level types incorporated here remain important, with or without a general log domain type. For now it seems that this is an implementation detail from the perspective of the Probability library. If there is a strong interest in such a type, perhaps this library could be refactored into two.. Again, I would opt for waiting to assess the acceptability of this library and the general level of interest in these different facets. I appreciate the comments and welcome other ideas. I hope that more people will look over the new version of the library and provide feedback. Thanks for your interest. Cheers, Brook -- Brook Milligan Internet: brook@nmsu.edu Department of Biology New Mexico State University Telephone: (505) 646-7980 Las Cruces, New Mexico 88003 U.S.A. FAX: (505) 646-5665