Could anyone please let me know that in phylogenetic analysis how branch length would be in decimal notation ?
Branch lengths are usually expressed in units of substitutions per site of the sequence alignment. so in terms of substitutions observed at particular site should be in Digits (0,1,2,3,...) like 3 subsitutions per site and my result shows one of my branch length with decimal notation 1.559E-3 (0.001559)
Please help me clarify my doubts regarding use of decimal notation and not individual digits number. ,, 0.001559 branch length
How could be 0.001559 substitutions per site? Method used was Maximum liklihood .
This isn't the most complete answer, but long story short, if your sequences contain 100 sites, and in a branch only 2 sites mutate, then you that branch contains .02 substitutions per site.
Also, keep in mind, many of the models are giving you only the expected number of substitutions per site in a branch, or might be reporting the average branch size. So even if your sequences hypothetically only had one site, you still wouldn't necessarily expect to see whole numbers.
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