Optimal trade What is it the state of the market? What is the volatility of the market? What is the equity being traded? What is the system or the trading orientation? What is the risk aversion of the trader or client? Types of error Type I error, also known as an error of the fi rst kind or a false negative, is the error of rejecting something that should have been accepted. Type II error, also known as an error of the second kind or a false positive, is the error of accepting something that should have been rejected. Expectations = Winning Percent x Average Winner - Losing Percent x Average Loser Top 10 hedge fund earners (2005) James Simons, Renaissance Technologies Corp.: $1.5 billion T. Boone Pickens, Jr., BP Capital Management: $1.4 billion George Soros, Soros Fund Management: $840 million Steven Cohen, SAC Capital Advisors: $550 million Paul Tudor Jones II, Tudor Investment Corp.: $500 million Edward Lampert, ESL Investments: $425 million Bruce Kovner, Caxton Associates: $400 mi...