Regression

It's the statistical process of determining the correlation between a dependant variable and one or more independent variables.  

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Resource: Linear regression (Yale Statistics) 

Type: Reference article  
Who it’s for: Anyone looking for a primer on the most basic and common approach to regression. 
Why we love it: This resource provides a helpful way to understand how and why we use regression. Topics covered include least-squares regression, outliers and influential observations, residuals, lurking variables, and extrapolation. 

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Resource: Correlation and regression – Statistics at square one (the BMJ) 

Type: Textbook excerpt 
Who it’s for: Anyone with a basic understanding of statistics and mathematical notation. 
Why we love it: This textbook excerpt uses correlation as a way into understanding regressions, which mkes it an intuitive and easy-to-understand resource.