Systematic assignment of numbers to physiologic responses, along with decision rules, so that PDD data analysis is more objective and standardized. The first such system was published by Dr. John Winter in 1936. Contemporary numerical analytic methods include the Rank Order Scoring System, Horizontal Scoring System, 3-position scoring system, 7-position scoring system, Empirical Scoring System, and the Lykken Scoring. Sometimes referred to as semi-objective analysis.