The number of down days, when trading is too quiet to generate much if any opportunity, depends in part on the criteria for initiating a trade as detailed in the trading plan. For example, a day trading plan that requires a predetermined movement away from a local high or low prior to establishing a trade will require a sustained price movement to trigger a trade. Depending upon the size of the requisite movement, days having a Daily Range Value below $500 may not often represent a profit opportunity and, based on the histogram, this may occur one in every five trading days. As another example, a trader who plans to capture only the relatively large movements in the Emini S&P 500, say beyond a $2500 Daily Range Value, should realize that such movements have in the recent past occurred only about 7% of the time.