Add an aggregation method to find the Nth most common value

MostCommon is a pretty useful aggregation method, for example when you have a large set of defective parts across different products and these are defective for different reasons and you want to see the most prominent error say per product. Very easy: MostCommon([Error]) OVER ([Product]).

But if you have a large set if parts (including the non-defective ones and for some reason you don't want to exclude them) with a reasonable yield > 50%, the result of such an expression might be "None" if that is the value in [Error] for non-defective parts.
Or if you already know your biggest yield detractor (e.g. [Error]="human processing error") and you would like to chase the 2nd biggest one.

Long story short: it would be great to be able to specify the n in NthMostCommon to get the most common (N=1), the 2nd most common (N=2) etc.