Quote from spreadem:
It seems to me that when a market moves quickly with with force and strong volume it is exhibiting a greater buying pressure than a market that slowly moves, covering the same distance but over a longer time frame.
Now ... how do you quantify that phenomenon?
Check out this website... They seem to have an indicator that measures the buying/selling pressure which correspond to the support/resistance level.
http://www.ftacademy.com/pages/pressure.htm
http://www.ftacademy.com/pages/images/pressure.jpg