Is it true that coefficient of variation is only meaningful if samples are positive. Why?

For a maths geek, you are showing the faintest trace of having balls, but you really should just give in. What you've been waiting on:





';You know it is and you know why. I'm not telling you all this stuff you should know already. You're being very naughty today and if you keep going, a spanked botty and no supper will be the result.';Is it true that coefficient of variation is only meaningful if samples are positive. Why?
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