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> No, the minimum and maximum values are derived by taking the mean and
> adding/subtracting the SD. If the SD is sufficiently large, it should be
> possible to make the minimum value negative. (I.e., if the error ratio is
> greater than 100%.) Not sure how you'd make the maximum go negative, but
> it's probably possible somehow...
How are you calculating the maximum BPM? I guess you are calculating some
minimum beat time using the mean and SD and then inverting it? Maybe the
minimum beat time is negative if the SD is too big compared to the mean?
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