# Linear Regression In SQL

2017-04-17

It looks a bit like someone has fired a shotgun at a wall but is there a relationship between the two variables? If so, what is it? There seems to be a weak positive linear relationship between the two variables here so we can be fairly confident of plotting a trendline.

Here is the data, and we will proceed to calculate the slope and intercept. We will also calculate the correlation.

It’s good to know that this is possible, but I’d switch to R or Python long before.

## Interpreting The Area Under The Receiver Operating Characteristic Curve

2018-09-19

Roos Colman explains what a Receiver Operating Characteristic (ROC) curve is and how we interpret the Area Under the Curve (AUC): The AUC can be defined as “The probability that a randomly selected case will have a higher test result than a randomly selected control”. Let’s use this definition to calculate and visualize the estimated […]

## Gaps And Islands: Solving Stochastic Islands Problems

2018-09-18

Itzik Ben-Gan shares with us a special case of the islands problem: In your database you keep track of services your company supports in a table called CompanyServices, and each service normally reports about once a minute that it’s online in a table called EventLog. The following code creates these tables and populates them with […]