## Common Distributions and Random Variables

A random variable, X, is a variable quantity (i.e., not necessarily fixed) whose possible values depend on a set of random events. Like a traditional mathematical variable, its value is unknown a priori (before the outcome of the events is known) A random variable’s possible values might represent the possible outcomes Read more…

## Recapping Covariance and Correlation

Covariance Covariance measures the extent to which the relationship between two variables is linear. The sign of the covariance shows the trend in the linear relationship between the variables, i.e if they tend to move together or in separate directions. A positive sign indicates that the variables are directly related, Read more…

## Refresher: Expected Value and Arithmetic Mean

In this refresh article, we are going to take you back to basics and quickly recap expected value and different types of mean. Although this is basic it is important that you are fluent with these terms to master the more advanced lessons coming later in this series. The expected Read more…

## Integration, Co-Integration and Stationarity Notebook Recap

Work through this notebook to refresh your understanding of Integration, co-integration and stationarity.