A single three-year period has just one start and one end. Move the start forward and repeat the calculation to obtain a set of rolling returns.
Compare the average, best, worst and spread using the same dates and holding period for comparable funds. The data range and benchmark matter. Rolling returns help describe the past; they do not tell you what the next period will deliver.
Explore the visual example ↗Educational only. No stock calls, fund ratings or forecasts. Personal circumstances and applicable policy or scheme terms matter.
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