Okay, feeling very dumb. Why do some people calculate fold change like this (B-A)/A and some others like this (B/A)?
I am trying to manually calculate the fold change for an RNA seq experiment and am reading conflicting ways of calculating this seemingly super basic measure.
HELP.
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lmmjrf •
I have never seen anyone use "(B-A)/A". While it's technically a fold-change, it's a confusing one since a value of 1 indicates that B is twice A. The standard way to manually calculate a fold-change is B/A.
You can calculate a value between -1 and 1 (-1 < x < 1) by using a similar formula (B-A)/max(A,B). Could this be what you have seen?
Presumably you meant to direct that toward OP.
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