It's a way of obtaining a measure of dispersion that is dimension-free.
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it is da same as coefficient of determination
Of course it is! If the mean of a set of data is negative, then the coefficient of variation will be negative.
coefficient of variation
Yes, you can have a negative coefficient in a direct variation. So if you had y = -7x, that would be a direct variation. If you have y = -x, I do not know, if that is what you mean. Hope it helped.
I have found the coefficient of variation of the first natural numbers and also other functions.