NCBI The Statistics of PSI-BLAST Scores CSH


Table 1

Transformation of and to g and g when -(10+k) affine gap costs are employed. The PSI-BLAST profile is derived from 128 statistically significant local alignments from the comparison of influenza A virus hemagglutinin precursor to SWISS-PROT. The parameters and are calculated analytically, while g and g are maximum-likelihood estimates. The values in parentheses are those inferred for the PSI-BLAST profile from the statistical parameters for BLOSUM-62.

Scoring system g g

BLOSUM-62 matrix 0.3176 0.252 0.134 0.035
PSI-BLAST profile 0.3175 0.254
0.134 0.040