I've noticed that some traders seem to use methods based on the irrational or esoteric. Perry Kaufman's classic "New Trading Systems and Methods" contains a serious chapter about astrological indicators. Some also believe in Elliott waves, Fibonacci numbers, Gann lines, and there are even experts and books about trading with them, although there is no rational explanation how those phenomena could affect asset prices or trade results. If you ask someone why he's using an irrational method, you normally get the response "because it works". Does anyone know of an objective, quantitative study of trade results by astrology, Elliott waves, Fibonacci numbers, or Gann lines - aside from anecdotal evidence?