Steadiness is a measure of the loss of existing groups, and cohesiveness is a measure of the introduction of false groups. Briefly, the steps to calculate the steadiness and cohesiveness are are outlined below. We direct the interested reader to for further details. First, one computes the shared-nearest neighbor distance between points in the original space and in the projected space and constructs a dissimilarity matrix identifying compression and stretching of point pairs. Then average partial distortions are computed by randomly extracting clusters from one space and evaluating their dispersion in the opposite space. Once such partial distortions are known one can aggregate the results into steadiness and cohesiveness,