1. The branch of statistics dealing with variables without making assumptions about the form or the parameters of their distribution
   "Nonparametric statistics were used to analyse the skewed data"

1. (statistics) a statistic computed without knowledge of the form or the parameters of the distribution from which observations are drawn
   "The researcher used a nonparametric statistic when the data did not meet the assumptions for parametric tests";
   - distribution free statistic

Type of: statistic, statistics, stats [informal]

Encyclopedia: Nonparametric statistics