Question: Do the BLAST scores have any relation between them?
0
gravatar for Bahrani
3.8 years ago by
Bahrani30
United States
Bahrani30 wrote:

Is there any relation among the BLAST scores (E-value, similarity, identity, gap, bit score)?  Is the e-value score for an alignment proportional to other scores, such as similarity score (i.e. the lower the e-value, the higher the similarity)?

Thank you!

ADD COMMENTlink modified 3.8 years ago by karl.stamm3.5k • written 3.8 years ago by Bahrani30
2
gravatar for Philipp Bayer
3.8 years ago by
Philipp Bayer6.5k
Australia/Perth/UWA
Philipp Bayer6.5k wrote:

The e-value is calculated by taking the score and including the number of sequences in your database, i.e., "what is the probability that I get this score with this many sequences?"

See previous discussions, E-Value In Blast or Blast E Value Calculation

The score depends on the length of your alignment and your chosen substitution matrix, see these slides

ADD COMMENTlink modified 3.8 years ago • written 3.8 years ago by Philipp Bayer6.5k
0
gravatar for karl.stamm
3.8 years ago by
karl.stamm3.5k
United States
karl.stamm3.5k wrote:

Yes they do.

https://en.wikipedia.org/wiki/BLAST

 

 

ADD COMMENTlink written 3.8 years ago by karl.stamm3.5k
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