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Sorry if this is noob-ish, but I was doing some really basic analysis between two data-sets and saw this was used as a way to calculate a sort of "normalized difference" (deviation?) between the old and new values. Again, my apologies for not using the mathematically correct terminology.

In Excel (because that's where I found it), using cells A1 and B1 for example, it's ABS(A1-B1)/MAX(A1,B1). In WolframAlpha it's Abs[x - y]/Max[x, y]. Formally:

$$\frac{|x-y|}{\max(x,y)}$$

Is there a name/precedent for this, maybe in the realm of statistics or analytics, or is it just something the guy before me made up?

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This is a specific case of relative difference.

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  • $\begingroup$ Awesome, thank you sir! $\endgroup$ – NateJ Jun 13 '17 at 23:17
  • $\begingroup$ Glad to help.${}$ $\endgroup$ – Jorge Fernández Hidalgo Jun 13 '17 at 23:17

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