"Y" represents the most recent closing price , and Yx represents the closing price a specific number of days ago. So, if the price of a stock closes higher today than it did 10 days ago, the ROC value point will be above the equilibrium, thus indicating to chartists that prices are rising in that particular issue. Conversely, if the price in today's session closes lower than it did 10 trading days ago, the value point will be below the equilibrium, indicating that prices are falling off. It is safe to say that if the ROC is rising, it gives a short-term bullish signal, and a bearish sign would have the ROC falling. Chartists pay great attention to the time period in the calculation of ROC. Long-term views of the market or a specific sector or stock, will use perhaps a 26- to 52-week time period for Yx and a shorter view would use 10 days to six months or so.