Counting the Trades You Did Not Take

A record of executed fills is a record of the setups a trader felt comfortable with, not of the setups the strategy produced. Separating the two, which is what the trading logs at orb trading metrics 1836 veterans are built to do, usually exposes a wider gap than any parameter change under consideration, because a skipped opening range breakout is rarely the average one.
The Sample Is Not What Happened

Most journals contain only what was filled. A setup that appeared and was hesitated over, skipped, or lost to a distraction leaves no trace at all, so the sample size a trader believes they have is smaller and more flattering than the real one. Every number derived from it inherits that bias quietly.
Why The Missed Ones Skew High

Hesitation clusters around the uncomfortable setups: the wide range after a gap up, the trigger arriving while the tape is moving fast, the one that fires immediately after a loss. Those often carry the highest expectancy in the set, because the conditions making them uncomfortable are the same conditions producing follow through with real relative volume behind it.
Logging A Non Trade
A missed setup needs one line: the date, the trigger, and what it would have done against the first profit target and the stop loss. It takes under a minute at the close and it turns an invisible cost into a number that can be tracked like any other. A trade journal holding only fills cannot report this at all.
What The Gap Reveals
When executed and generated results sit side by side, a difference between them is an execution problem rather than a strategy problem, and it gets fixed by process instead of by testing. Splitting the two by setup and by session keeps a working method from being rewritten over a shortfall that no backtest would ever have produced.
A Reasonable Target
Nobody takes every signal. Capturing eighty percent of generated setups is a realistic standard for a discretionary trader, and holding the figure at all puts someone ahead of most. Whether it improves across a quarter matters far more than the level it starts from, and a trading plan naming the number gives it somewhere to live.