money flow index
Typical price = (high + low + close)/3
Money flow = typical price * volume
Money ratio = positive money flow / negative money flow
MFI = 100 - (100 / (1+ money ratio)) OR
MFI = positive money flow / (positive and negative money flow) * 100
(Both formulas arrive at the same MFI value.)
Values below 50 indicate that the stock is undersold, while values above 50 indicate that a stock is overbought.