Tech Notes

Q. What is the number that appears when mousing over a tree branch?

A. The number displayed for a tree branch represents the distance between the children under the branch node. In general, the distance is calculated by 1 - correlation value, if a correlation metric was used for clustering.



For example, if two samples are grouped under one branch with a distance x, the actual correlation is 1 - x. So if the distance is x = 0.2, the correlation is r = 0.8.