Quote from Tums:snip. . .
Does the next trade foretell the hidden sentiment? I mean if there is an upside bias in the market, the next trade would naturally follow in that direction.
But the exchange receives market orders all the time, the next trade might well be a hit on bid. And the chart will appear a price drop to 1414.25?
This is a great illustration of how when one side gets eaten up, price moves in that direction. The details on the DOM is a few months down the road. In the meantime, what's interesting in MB's diagram is the relationship of the price bar's volatility to the bid/ask size. Price jumped 2 ticks quickly because of the size.
This may seem a bit off topic but it's directly related to the price/volume relationship. Take a look at MAK's "volaility spreadsheet"
http://www.elitetrader.com/vb/attachment.php?s=&postid=1319868
This drill was suggested by Jack. Go through a day, actually do several days with different ranges, and circle on the spreadsheet where each of the 81 daily bar's volatility is located. You will see an obvious relationship, among several. Higher volume = larger range, etc.
What may not be as obvious is on certain days all the ranges are skewed toward either the larger or smaller volatility range for a given volume. For example, today volume of 10,000 on a 5min ES bar may give you a 1.75 point bar, and tomorrow or next week you only get a .75 - 1 point bar.
The reason is most likely the size of the Bid/Ask vs the size of the orders hitting them.
FWIW, (and hopefully to head off the thread going into a DOM discussion) on every tick change up and down the DOM is changing, or you could say the controlling side is changing. Think of how many times it changes during a single bar. If you try to use it to trade off of at this level it will whip saw you to pieces and things will get ugly real quick. Spydertrader will cover it at the appropriate time.
Regards - EZ