blast序列比对中E值是什么意思?

E value——E(Expect)值,表示随机匹配的可能性。E值越大,随机匹配的可能性也越大。E值接近零或为零时,具本上就是完全匹配了 E-value - this tells you the probability of getting this sco...

E value——E(Expect)值,表示随机匹配的可能性。
E值越大,随机匹配的可能性也越大。
E值接近零或为零时,具本上就是完全匹配了

E-value - this tells you the probability of getting this score and homology by chance (from random sequence), that is, the lower (the higher the number behind e-), the more reliable the result is. As I have mentioned above, it's not only about homology, but also about the length, because you can easily find any piece of 10 nucleotides in 3mld human genome with 100% homology, but if you have 350 nucleotides and get 70% homology, than it's still quite good

  • 发表于 2018-05-17 10:45
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