- 1
Blast search 시,
| Max score | Total score | Query coverage | E value | Max ident |
|---|
이 용어들의 의미가 뭔가요?
또 어떻게 구해지는지 좀 알려 주세요...
- Blast
각 분야 한인연구자와 현업 전문가분들의 답변을 기다립니다.
-
답변
최형석님의 답변
2012-01-18- 3
-------------------------------------질문-------------------------------------
Blast search 시,
Max score Total score Query coverage E value Max ident 이 용어들의 의미가 뭔가요?
또 어떻게 구해지는지 좀 알려 주세요...
http://www.ncbi.nlm.nih.gov/BLAST/tutorial/Altschul-1.html
http://www.ncbi.nlm.nih.gov/books/NBK21097/
- Max score: 가장 높은 alignment score (bit-score)
The value S′ is derived from the raw alignment score S in which the statistical properties of the scoring system used have been taken into account. By normalizing a raw score using the formula:
a “bit score” S′ is attained, which has a standard set of units, and where K and lambda are the statistical parameters of the scoring system. Because bit scores have been normalized with respect to the scoring system, they can be used to compare alignment scores from different searches.
- Total score: alignment score (bit-score)의 합
- Query coverage: database 시퀀스에 match된 query 시퀀스 길이의 퍼센트
- E value (Expect value): 우연히 똑같은 시퀀스를 만날 확률. 즉 0에 가까울 수록 significant match 임.
http://www.ncbi.nlm.nih.gov/books/n/handbook/A1237/def-item/app42/