i fabricated microelectrode based on prussian blue to detect hydrogen peroxide. i asked to calculate percentage coefficient of variation for the measurement of a suitable hydrogen peroxide concentration? does it main (correlation coefficient R2)
Hello Ezzaldein -
I don't know your field and may not understand your question, but if you want to know if a correlation coefficient is the same as a coefficient of variation, then no, it is not.
I have seen "coefficient of variation" (cv) used in different contexts, but it is basically a standard error divided by the thing for which you have that standard error. In official statistics where I worked, and the 'thing' was a total, it is often referred to as a "relative standard error." In that case it is the (estimated) standard error of an estimated total, divided by the estimated total. But a cv could be for some other parameter or statistic, or an individual predicted value. You have to check the context.
I think you can sometimes think of this as being like the reciprocal of a t-value.
But perhaps that was not your question.
Best wishes. - Jim
PS - Let me put it this way: An estimated cv for a parameter is an estimated standard error of a parameter, divided by that estimated parameter. Say, se(x)/x.
Hi Ezzaldein Jomma,
percentage of coefficient of variation is nothing but relative standard deviation (RSD), which was commonly used for the estimation of the error percentage of the measured sensor signal at several times.
Question: For this application are you using standard error, or standard deviation? (If it gets smaller with a larger sample size, that is a standard error. But a population standard deviation is fixed.)
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