A good way to think of Coppock is as a way to measure the state of sentiment. That is what share prices do but it is easier to read with Coppock which tends to move in long slow swings. Since 2006 there have been five Coppock buy signals on this chart of the Nasdaq Technology index which is roughly one every three years. The last one on this chart, before the latest one, was three and a half years ago so we were due for another one.
