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Neighbor joining
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=== Distance from the pair members to the new node === For each of the taxa in the pair being joined, use the following formula to calculate the distance to the new node: {{NumBlk|:| <math>\delta(f,u)=\frac{1}{2}d(f,g)+\frac{1}{2(n-2)} \left [ \sum_{k=1}^n d(f,k) - \sum_{k=1}^n d(g,k) \right ] \quad </math> |{{EquationRef|2}}}} and: : <math>\delta(g,u)=d(f,g)-\delta(f,u) \quad </math> Taxa <math>f</math> and <math>g</math> are the paired taxa and <math>u</math> is the newly created node. The branches joining <math>f</math> and <math>u</math> and <math>g</math> and <math>u</math>, and their lengths, <math>\delta(f,u)</math> and <math>\delta(g,u)</math> are part of the tree which is gradually being created; they neither affect nor are affected by later neighbor-joining steps.
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