# Share price and volume relationship

### Price and Volume Correlation | Seeking Alpha

Explaining the price-volume relationship: The difference between price changes and . versus price pressure and the effects of information on share prices. Keywords: The Stock Price Trading Volume Relationship; Market . between the ratio of short interest to total outstanding shares in the stock. A positive up/down volume ratio is key when a stock is trying to Yet investors should resist the temptation to buy shares right after a stock goes public. which compares the total amount of volume during up days in price vs.

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Therefore, the higher the correlation, the better acting the stock is. If the correlation was strongly negative, we may see a constructive short forming. What we would like to see is that large increases in price correspond to large increases in volume, and vice versa. This would show us that price is being backed up by volume.

A statistical way of saying that two series are moving together is correlation. Correlation is bound by 1 and -1, with 1 being a perfect positive correlation and -1 being a perfect negative correlation. An example of a high correlation series is the correlation between rainy days and days with clouds in the sky. An example of high negative correlation would be the correlation between rainy days and the days the pavement stays dry outside.

### Cross-correlations between volume change and price change

One thing must be noted though, correlation does not equal causation. Just because price and volume may be highly correlated does not mean that volume is the reason for the price moves.

It may be earnings, news, etc. Correlation is calculated as the covariance of two series divided by the product of their standard deviation. By listing two series side by side in this case, the percent change in price and the percent change in volumewe can calculate the mean, cross-product of the differences between actual percent change and the mean, and then the standard deviations, and arrive at the correlation.

The correlation of price to volume for MSFT over the past 63 days is 0. Here we see there is a low correlation between the two and this may not be helpful for MSFT. But what about a strong stock? NFLX to see if there a higher correlation. In this light, higher correlations would show us stronger stocks and could be used for ranking and screening of stocks more probable to move up than down.

We see that NFLX has a much higher correlation, and may have more constructive price action and supporting volume. However, is this reliable? One way to check is to use a scatterplot to find outliers.

• Price and Volume Correlation
• Cross-correlations between volume change and price change

Values that are far away from the pack of observations high variance from the sample can skew the correlation and take away from its meaningfulness. Here is the scatterplot for NFLX: Outliers exist in this graph to the upper right some gap days to be sure, with high volume and high price moves.

High volume indicates an active market; in an active market, the spread between bid and asked prices is usually narrower. High volume is often characteristic of the initial stage in a new trend, such as a breakout in a trading range. Before a market bottom, investor nervousness leads to panic selling, a characteristic of which is high volume.

High volume is also attributable to a market top when strong buyer interest exists. Low volume often exists during an unsettled period, such as at a market bottom. Low volume reflects a lack of confidence that is usually indicative of a consolidation period when prices are within a sideways trading range.

A sizable increase in volume may point to a breakout start or climax culmination of a move, which may be temporary or final. In a rare case, it may represent a shakeout.

Volume typically follows a trend, expanding on rallies and decreasing on reactions. Volume is useful in ascertaining how strong a change in expectations really is. How volume and price moves reveal the market's trend It is important to look at the relationship between volume and price. A price move, up or down, that is on higher volume is more significant. Therefore, an analysis of price and volume allows the investor to better interpret the trends in price and any changes thereto.

In other words, volume gives an indication of the strength momentum of a move in price.