The Wilcoxon signed-rank test is a non-parametric statistical test to compare two related samples. Learn how it works, and how to run it in R in this tutorial.

Probability is used to quantify the randomness of a model's behavior. In this article, we'll go over the basics of probability including probability functions, random variables, sample and event spaces, addition and multiplication laws, the binomial distribution, conditional probability, expected value and odds to probabilities.

Statistics is a mathematical science including methods of collecting, organizing and analyzing data in such a way that meaningful conclusions can be drawn from them. Learn the basics of inferential and descriptive statistics in our tutorial.