What Are Non-parametric Tests?
: What Are Non-parametric Tests? Non-Parametric statistical tests have much less restrictive assumptions concerning the distributions of the variables and the variances of comparison groups. Indeed these techniques tend to rely upon the rank of the individual observations rather than their absolute numeric values. Slide 10: The computations are also generally easier to understand. However, they have the following disadvantages; 1. You lose the metric and numerical values of the results (since only the ranks, not the numerical values are used) Slide 11: 2. when the sample size is small, you can lose considerable statistical power compared to using Parametric statistics (although the statistical power of parametric and non-parametric testing tends to be very similar at larger sample sizes). Procedure of hypothesis testing : Procedure of hypothesis testing DEFINITION-hypothesis testing : DEFINITION-hypothesis testing Hypothesis tests are procedures for making rational decisions about the
