This filter tells you how well or poorly each stock’s price matches a straight line.  0 represents a stock moving up or down in a perfectly straight line.  1 represents a stock which does not move in a linear pattern at all.  This filter describes a stock’s price over the previous 8 trading days.

A stock with a low value is sometimes called a "bunny."  This means that the stock has picked a direction and now keeps going and going.