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  Statistical Techniques and 6 Sigma
  Help with Coefficient of Variation

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Author Topic:   Help with Coefficient of Variation
bp0001
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posted 02 August 2001 11:12 AM           Edit/Delete Message   Reply w/Quote
I am trying to compare the mortality rate of a current population to the mortality rate of a prior population. I am evaluating the statistic

X=(number of deaths in current population) / (prior mortality rate*current exposure)

Is the coefficient of variation

1/sqrt(number of deaths of current population)

This was given to me by someone, but I can't work out the logic. If it is, can you tell me why?

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Rick Goodson
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From:Wuakesha, Wisconsin, USA
Registered: Aug 2000

posted 03 August 2001 06:04 PM     Click Here to See the Profile for Rick Goodson   Click Here to Email Rick Goodson     Edit/Delete Message   Reply w/Quote
bp0001,

I am not sure I understand your question. Never the less...

The Coefficient of Variation is a relative measure of dispersion. It is the standard deviation divided by the mean multiplied by 100 to give a percentage value. This measure can not be used when the data takes both positive and negative values. It is usually associated with Log-Normal distributions where the values are all positive and are markedly skewed such as the survival times of bacteria when treated with a disinfectant.

Hope this helps.

Rick

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