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dave i know ES is extreme spread but what does sd mean please

 

 

Long time since I tutored in stats but in a big sample, 68% of data will fall within plus or minus one std deviation, 95% will fall within two sd's and 99% within three.

 

In reality, the ES is more valuable as it tells you the worst case scenario, in this small sample at least.

 

Chris-NZ

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