Using ellipsoids   

While getting some confidence that our balance approach was sound, in a paper on mango ionomics \cite{Parent_2013a} , I used the ionome with an in-house classification technique based on the Mahalanobis distance to classify samples among high and low crop yields. The algorithm iterates to isolate true high yielders (high yields correctly diagnosed as high yields) as reference. Now let’s see if the Mahalanobis distance is useful (shaded region in figure \ref{385754}).