These filters compare the current price to the price on January 1.

The formula for the $ version is simply the current price minus the old price.  Bigger numbers mean that the price has moved up more.  Negative numbers mean that the price has moved down.  0 means no change.

This filter also works as a %.  This uses the standard percent formula:  (new value – old value) / old value * 100.

The current price is based on the last print.  There is no smoothing or averaging.  This updates before, during, and after market hours.