Selection Over FrequencyMeasuring Your Edge

More trades is not more opportunity. What happens to an edge when you take setups that only nearly qualify. This lesson covers: More trades is not more opportunity, What marginal trades do, Costs scale with count, The hidden cost of activity, Why it happens, A day with nothing, Focus applies to instruments too, More markets, more chances?, Grade your setups, Put it together.

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Going deeper

More on selection over frequency

Overtrading is usually described as a discipline problem, but it is also an arithmetic one: every marginal trade adds a full unit of risk and a full set of costs while contributing little or negative expectancy.

This is the mechanism behind the common experience of a method that "stopped working". Frequently nothing about the method changed — the criteria for taking it quietly loosened.

Common mistakes4
  • Relaxing entry criteria on quiet days to have traded something.
  • Adding instruments to increase opportunity, which divides attention rather than multiplying edge.
  • Counting a day with no trades as a wasted day.
  • Failing to grade setups at the time of entry, which makes dilution impossible to detect afterwards.
From experience2
  • Grade each setup A/B/C before you know the outcome, then measure expectancy by grade after fifty trades. The result is usually clarifying.
  • Set a realistic expectation for how many setups your method should produce. If you are taking three times that, the criteria have drifted.
Questions people ask3

How many trades should a method produce?

It depends entirely on the criteria. What matters is whether your actual count matches what the method should generate — a large gap indicates loosened standards.

Is it better to trade one instrument or several?

One instrument watched closely usually produces better reads than several watched loosely, because behaviour is learned slowly and does not transfer between markets.

How do I stop overtrading?

Write the criteria down away from a live chart, grade every setup against them, and track how many trades you took that did not qualify. Measurement changes behaviour more reliably than intention.