#### 6.5.4 Quality of representation

The quality of representation of a point in the coordinate system, defined
by the chosen numbers of dimensions, is defined as the ratio of the squared
distance of the point from the origin in the chosen number of dimensions, over
the squared distance from the origin in the space defined by the maximum number
of dimensions. It is also equal to the sum of COS^{2} j .

Quality = å
COS^{2} j

A low quality means that the current number of dimensions does not represent
well the respective column or row point.