In investing, absolute errors are expressed in dollars. For example, at the beginning of 2015, Amazon.com stock was trading for about $313 per share. Let's say you forecast that Amazon would be ...

Properties of two large families of scale-free forecast accuracy measures that include popular measures such as mean absolute percentage error, relative error, and squared percentage error, are ...

If you predict a stock's value to be $100, whether it becomes $105 or $95, you were "off by $5" either way. Relative error ...