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Performance

Sample size

How many trades a performance figure is based on. Below roughly fifty, results mostly measure variance rather than method.

Any method with a realistic win rate produces stretches that look excellent or disastrous by chance alone. Meaningful expectancy figures need a sample in the low hundreds.

Taught in

Reading Your Own ResultsMeasuring Your Edge

How many trades before a number means anything, and how to tell a losing run from a broken method.

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