In this article we describe how to perform linear regression. We go over some linear…

There are several reasons to log transform the response. The obvious one is to fix…

In linear regression, you fit the model (1) However, often the relationship between your…

In this post we analyze the residuals vs leverage plot. This can help detect outliers…

In this post we describe how to analyze a scale location plot. You may also…

In this post we describe how to interpret a QQ plot, including how the comparison…

In this post we describe the fitted vs residuals plot, which allows us to detect…

Note: this is loosely based on Coursera’s A Crash Course on Causality: Inferring Causal Effects…

Background Classical statistics was developed to study how to collect and analyze data in the…

You should use non-parametric tests when the most naive distributional assumptions of a parametric test…