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Hello, The "Shift Dist" in Analysis is: sqrt(d1*d1 + d2*d2) where d1 = delta1*scaleFactor1 and similarly for d2, where the scale factors are as entered in the dialog and the deltas are just the differences of the shift values. This looks like eqn (1) in that paper. The "Shift Sum" is abs(d1) + abs(d2). This looks like eqn (5) in that paper. I'm not sure there is any perfect answer here. Wayne On Fri, 25 Jan 2013, Marie Tremblay wrote: > Hi, > > I am using the Data Analysis > Shift differences to compare 2 peaks lists. Is the method to calculate the "Shift sum" and "Shift dist" comes from the reference "Schumann FH, ..., Kalbitzer HR. Combined chemical shift changes and amino acid specific chemical shift mapping of protein-protein interactions. J. Biomol. NMR. 2007 Dec;39(4):275–89"? > > Cheers, > Marie >