I am not sure this is the right forum for this -- I have a question about a particular paper: http://www-users.cs.umn.edu/~sboriah/PDFs/ChandolaCBK2009.pdf The authors describe 4 heuristics that can be derived from categorical data -- this is in order to map categorical data to numerical. These heuristics are d_m, f_m, n_x, f_x. They also provide two examples y and z and the values of the quantities above computed with respect to dataset in table 3. I am able to lock into their values exactly for d_m and f_m but I cannot reproduce n_x and f_x. Could someone read this paper and try to derive these values? I basically take it their equation (3.3) shows summation of reciprocals of arity for A_x set (i.e. the set of mismatching attributes) -- I can't reproduce -5.45 and -7.90. Please note I already contacted the authors -- one responded that Dr. Boriah is the person responsible for these calculations but he is apparently not reachable.