scott wrote:
>> 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?

Minimum = mean - SD
Maximum = mean + SD

(But remember that it takes the mean and SD over the beat period, and 
then takes the reciprocol of that to compute the BPM value.)

So, yes, as I asserted, if SD > mean than one of the figures comes out 
negative.

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