Ah, absolute error is the raw difference between your measured timing and the true period, while relative error compares that to the true value, and percentage error just puts it in percents. But in our damp college lab, the "true value" from the book never matches—the cane in my workshop swells with humidity too, changing its bend. So I tell students their most honest error is the consistent one their own hands make, watching that pendulum swing, *shyieng* for the click of the stopwatch.
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