Data Science SQL

Root mean squared error

SELECT SQRT(AVG(POWER(y - y_pred, 2))) AS rmse FROM ...

Mean absolute error

SELECT AVG(ABS(y - y_pred)) AS mae FROM ...

Mean error

SELECT AVG(y_pred - y) AS me FROM ...

Median - get it here

SELECT MEDIAN(y) FROM ...

Published September 10, 2015


You might also enjoy

Verify Slack Requests in Rails

Adding CSP to Rails

Google OAuth with Devise


All code examples are public domain.
Use them however you’d like (licensed under CC0).