ES and SD- Chrony question

skyfish

October 24, 2010 15:41

What are these terms and how are they used. I write all my speeds down and not sure of the way to use these. I believe the ES is the highest and lowest reading ever recorded, for that load? The SD is normal deviation for a group? How is that figured, averaged for several groups?

Thanks

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  perry shooter

  October 24, 2010 15:52

  most Chronographs have a program built in to give you SD

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  SoreShoulder

  October 24, 2010 17:17

  http://en.wikipedia.org/wiki/Standard_deviation
  
  It's kinda complicated so I'll let the experts tell it.

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  RCrosby

  October 25, 2010 04:47

  ES, extreme spread, you're right, difference between highest and lowest recorded velocities.
  SD, standard deviation, as already suggested, complex and best explained by the experts. Essentially a measure of expected variation of a given percent of rounds in a sample of given size. Smaller is better. Zero would be ideal, but will never happen.

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