Uncertainties and Ambiguities in Percentiles and how to Avoid Them
  The recently proposed fractional scoring scheme is used to attribute publications to percentile rank classes. It is shown that in this way uncertainties and ambiguities in the evaluation of percentile ranks do not occur. Using the fractional scoring the total score of all papers exactly reproduces the theoretical value. 
Michael Schreiber
stat.OT cs.DL physics.soc-ph