Hands-On Machine Learning on Google Cloud Platform

Root mean square error

Another approach of solving the problem of inconsistent signs of error is to square the error (the square of a negative number is a positive number). The scenario discussed previously can be translated as follows:

	Actual value	Predicted value	Error	Squared error
Data point 1	100	120	20	400
Data point 2	100	80	-20	400
Overall	200	200	0	800

In this case, the overall squared error is 800 and root mean squared error is the square root of (800/2), which is 20.

The accuracy in the case of a classification exercise is measured as follows: absolute error and RMSE are applicable when predicting continuous variables. However, predicting an event with discrete outcomes is ...