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A
factor of improvement is different
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than a
percent improvement …
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factor = new_rate/old_rate
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percent = 100 x (new_rate-old_rate)/old_rate
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Expressing
an improvement by it’s
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factor
is simpler, especially for large
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changes
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El Guerrouj’s 7% improvement over Bannister
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is a 1.07 factor of improvement
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