The number of stocks trading on an uptick minus the number of stocks trading on a downtick. Tick index is a popular indicator used by day traders to view the overall market sentiment at a given point in time. By being able to easily see the ratio of “up” stocks to “down” stocks, traders can more easily make quick trading decisions that are dependent upon market movement.
TRIN = (advancing issues/declining issues)
(volume of advancing issues/
volume of declining issues)