I thought of another way to define support / resistances just by calculating a histogram on the price. You can weight the counts by the trade volume, so the histogram would reflect the true number of shares that traded hands at each price point. Then you can draw support resistances at the peaks of the histograms -- only here there is no way to distinguish between support or resistance. You can also weight by time so that past trades are counted less and recent trades more. Let me know what you think! http://www.myquant.net/
Crazy b*sturd!