In article <kjpurbhb01.fsf at alpha0.bioch.virginia.edu>,
William R. Pearson <wrp at alpha0.bioch.virginia.edu> wrote:
>>>Steven Smith <ssmith at itis.com> writes:
>>> You do need to be careful when comparing e-values. They take into account
>> the size of the database searched. The e-value means "I expect to find X
>> hits when searching this sequence with a database of size Y." So e-values
>> are comparable when Y's match.
>>Although "bit" scores are not so intuitive, Steve Smith's post
>highlights their advantage over E()-values. Both blast2 and fasta33
>"bit" scores attempt to summarize the same information, which is
>database size and query size independent.
Most of our software that parses the blast output uses and stores the E-value.
Is there a formula for converting bit-score, database size into an E-value?
Gary
