Why a calendar
Data laid out as a table or list makes it hard to feel the passage of time. A calendar, by contrast, shows day-of-week, week-of-month, and monthly patterns at a glance — surfacing time-based patterns a table would easily hide.
What to look for on the calendar
- Are losses clustered on a specific day of the week (e.g. Monday gap trades, Friday position-closing pressure)?
- Is there a pattern tied to a specific time of month, like month-end or month-start?
- Are there multi-day losing stretches, and did they recover right after?
- Is there a difference in trade count between your good weeks and your bad weeks?
Pair it with the monthly summary
Don’t look at individual days alone — pairing them with the monthly P&L summary lets you tell whether a good month was genuinely consistent performance or an illusion created by one big day.
Turn a pattern into a hypothesis
Once you spot a pattern on the calendar, form a hypothesis about why, and deliberately test it the following month. If Fridays show heavy losses, for example, intentionally reduce risk on Fridays for a few weeks and compare the results.
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