by Richard Arms, combines price and volume in a two-dimensional
box, rather like a candlestick without the up and down strokes.
The width of the box illustrates the volume in that period, and
for this reason the x scale is in volume measurements, not time.
Short wide (fat) boxes (heavy volume accompanied with small changes
in price) usually indicate turning points. Boxes which penetrate
thru support or resistance levels are important, as volume is believed
to confirm price action. A "power box" is both long and fat, and
provides good corroboration of breakouts. if you are day trading,
these indicators may or may not help you, as the extra information
contained in the width might cause an emotional response in you,
and that is something to be avoided at all costs.