Table 3: Gross Performance of Day Traders Partition Range Buy less Sell Return (%)t-stat Mean Daily Gross Profit ($NT Mil) t-stat % Days with Profit (.2, ∞)0.62261.73*8.67128.92*97.0* (.1,.2)0.43848.03*10.84230.36*94.9* (0,.1)0.29640.33*14.03028.24*92.1* (-.2, 0)0.10128.67*16.34225.13*89.3* (-.4, -.2)-0.094-21.24*-14.477-18.35*21.1* (-∞, -.4)-0.240-25.56*-12.419-21.49*18.0* Panel B: Individual Investors Partitioned by Standardized Past Profits