Talk:Nucleotide diversity

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The definition is very unclear. It refers to two DNA sequences, then proceeds to use I and j to index some large number of sequences. There is confusion about sequences vs nucleotide sites, and about the definition of the x values.Tedtoal (talk) 07:13, 6 January 2011 (UTC)

The formula could be given in the following way to make clear that only non-redundant pairwise comparisons are calculated:

$\pi =\sum _{i<j}x_{i}x_{j}\pi _{ij}=\sum _{i=1}^{n}\sum _{j=i+1}^{n}x_{i}x_{j}\pi _{ij}$

I agree with Tedtoal that parameters should be clearly defined. It might be good idea to define $\pi$ as pairwise differences between all alleles over all pairwise comparisons over length of region:

${\frac {\Pi /(n(n-1)/2)}{L}}$

12:31, 11 January 2011 (UTC) —Preceding unsigned comment added by 194.94.96.194 (talk)