『osu!』BeastrollMC explains Unstable Rate
In this video, BTMC (BeastrollMC) explains what Unstable Rate actually is. If you were confused before, this video should be helpful to you. osu!
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Unstable rate represents the consistency of the timing of the hits, where lower numbers are better (top players often score below 100). Note that the value measures consistency, not accuracy, so consistently in hitting 15ms early is the same as consistently in hitting “on time.” The formula is essentially the standard deviation of the hit errors (in milliseconds) multiplied by 10.