Reply To: What is standard deviation?

Forums General Discussion What is standard deviation? Reply To: What is standard deviation?

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Scotchmo
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SD is one of the most valuable pieces of information that you can get from the chrony. It’s nice to know both SD and ES. But I usually ignore the ES, as SD tells me a lot more.

Example:
Assume two 10-shot strings.

10 shot string #1:
ES=44fps
SD=14fps
Average=800fps

10 shot string #2:
ES=40fps
SD=20fps
Average=800fps

SD is a better indicator of shot string quality and hit probability.

If shooting a difficult field target, a gun yielding string #1 will likely give a much higher target hit rate than a gun yielding string #2. That is an extreme example, but it still holds for examples with lower ES and lower SD.