this is from NMF package from R studio: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.192.3637&rep=rep1&type=pdf
"Several approaches have been proposed to choose the optimal value of r. For example,
[Brunet et al., 2004] proposed to take the first value of r for which the cophenetic coefficient
starts decreasing, [Hutchins et al., 2008] suggested to choose the first value where the RSS curve
presents an inflection point, and [Frigyesi and H¨oglund, 2008] considered the smallest value at
which the decrease in the RSS is lower than the decrease of the RSS obtained from random
data. "
another useful link:
https://stackoverflow.com/questions/17199575/explain-extractfeatures-from-the-nmf-package-in-r
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