This chart shows the best day of the week to DCA based on the average percentage difference from a moving average. For example, using the default 7D SMA, a value of 1 on Sunday would indicate that the price on Sunday is on average 1% higher than the average price of the past 7 days. Therefore the day that has the lowest value on this chart is the best day of the week to DCA. It is important to note that the source data uses UTC closing prices only. If Monday turns out to give the highest ROI then it refers specifically to the price at UTC closing time, not the entire day.