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A very positive result over a few trades may seem convincing, but a small sample carries more uncertainty.
Five trades, for example, can produce an exceptional sequence by chance. That doesn’t mean the same behavior will be observed when the strategy is applied many times and under different market conditions.
Increasing the number of observations helps you better see the distribution of results, the frequency of wins and losses, and the strategy’s natural variability. A larger sample doesn’t guarantee a better outcome, but it can provide a broader view of the observed behavior.