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Advancing volume refers to the total volume traded for securities that advanced or closed above their opening price. Declining volume refers to the total volume traded for securities that declined or closed below their opening price.
The Cumulative Volume Index, CVI, determines whether money flows into or out of the stock market, and thus can be used to confirm the direction of the market. The CVI is calculated by subtracting the volume of declining stocks from the volume of advancing stocks and then adding that result to the previous day's CVI value. The CVI composite uses the volume from three U.S. exchanges (New York Stock Exchange, NASDAQ and American Stock Exchange) to calculate the advancing and declining volume.
The higher the volume associated with advancing stocks is compared to the volume of declining stocks, the higher the Cumulative Volume Index value (good news, money is flowing into the market). The lower the volume associated with declining stocks is compared to the volume of advancing stocks, the lower the Cumulative Volume Index value (bad news, money is flowing out of the market).
The direction of the CVI can be used to determine the direction of the market. You can also use the divergence between the CVI and an index prices (S&P 500 index or a broader index for example) as a way to detect potential corrections. An increase in the CVI and a decrease in the market index may indicate that a correction is near and that a reversal may occur.
