[問題] N50
關於genome在做assembly時，paper都會提到N50 size為多少。
這是網路上我所查到的定義：
http://www.cbcb.umd.edu/research/castats.shtml
The N50 size of a set of entities (e.g., contigs or scaffolds) represents the
largest entity E such that at least half of the total size of the entities is
contained in entities larger than E.
For example if we have a collection of
contigs with sizes 7, 4, 3, 2, 2, 1, and 1 kb (total size = 20kbp), the N50
length is 4 because we can cover 10 kb with contigs bigger than 4kb.
我的解讀是佔50%的contig, 所以20kbp的N50應該是10kbp
不過看了下面的例子又明顯不是這樣...
請問N50的定義到底該怎麼下呢？
謝謝不吝解惑.
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