Hi,
I have used Wyckoff's theory of Volume for a number of years and have developed workable rules in many markets for stock , stock index futures, and Forex. There are numerous types of volume which must be accounted for and this depends on which instument is traded on which exchange. The main volume types are: tick, on balance, and activity. Each have their own advantage. Also, I have used many software packages which act as interfaces for charting software and they each have slightly different rules of data collection, computation, and display.
With regards to Eries question regarding time I will attempt a short response. Remember that the Livermoor formula is based on this principle and becuase of his meticulous record keeping, he was able to develope the complete formula by adding a time element. However, I think the formula is only marginally useful and many developments have come since then.
Time: one always observes liquidity and high volume half hour after and before the close which gives a U shaped distribution. Like the exponential average, you need to develop a system that accounts for this . Find the time of average volume with whatever type of volume you are using. Then apply the theory of Accummulation and Distribution. Back test then forward test and you may observe the action of MMs, Commercials, and large speculators without noise. This is most imporatant in Forex and I belive is a reason why so many fail in this market. I think it is one of the easiest to read because I have defined the time element.
Strength - appears as a result of buying or the absence of selling in relation to momentum. It appears on down bars which is why so many people get screwed when trying to position. They chase the market and position after the strenghth has appeared in an up move.
Weakness - appears as a result of selling or absence of buying in relation to momentum. It appears on up bars again screwing people into positions as above. They chase the market and position after the weakness has appeared in a down move.
I have rules for different markets and use a range of technical indicators to address market conditions. The great thing about reading volume is that it is not a complex moving average of price distribution which the majority of indicators (not all) are. DoM does not give significant edge any more. Therefor to read volume which incudes a summation both of selling and buying is a skill that can be learned.
I will share one of my rules developed initially by R Wyckoff.
Rule 1-Weakness appears indicating a reversal or correction:
Part A) Using 10 minute intraday charts - If average or slightly above average volume appears on 6 bars, and there is diminishing price spread (yet volume remains average or a bit above), there is no demand indicating a potential reversal/correction.
Part B) If the next bar is down followed by 2 or 3 low volume up bars on narrow spreads-sell your house,yacht, wife, dog and short the market with everything you have.
As a caveat - the time element is most important because you have to know when the maket is giving the correct volume. THIS IS THE SKILL TO LEARN and very few do so! I have been hit so many times I carry the scars.....and still make silly mistakes.
Good hunting!
JJ777