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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 unregistered 
posted 02 August 2001 11:12 AM
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? IP: Logged 
Rick Goodson Forum Wizard Posts: 135 
posted 03 August 2001 06:04 PM
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 LogNormal 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 IP: Logged 
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