The Odd Differential Index is a market sentiment. This index is simply calculated by subtracting the daily or weekly odd-lot sales from the daily or weekly odd-lot purchases. High readings appear near market tops and minus readings near bottoms. Introduced by Wall Street Courier, the Odd -Lot Differential Index indicates the market sentiment of small investors who purchase less than 100 shares of a stock. These market participants are usually wrong about the direction of the market and this indicator is therefore considered to be a contrary opinion sentiment indicator.
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The Smart Money Flow Index is calculated by taking the action of the Dow in two time periods: the first 30 minutes and the close. The first 30 minutes represent emotional buying, driven by greed and fear of the crowd based on good and bad news. There is also a lot of buying on market orders and short covering at the opening. Smart money waits until the end and they very often test the market before by shorting heavily just to see how the market reacts. Then they move in the big way. These heavy hitters also have the best possible information available to them and they do have the edge on all the other market participants. Whenever the Dow makes a high which is not confirmed by the SMI there is trouble ahead or the other way round.