Standard Deviation

In statistics and probability theory, the standard deviation (SD) (represented by the Greek letter sigma, σ) shows how much variation or dispersion from the average exists. A low standard deviation indicates that the data points tend to be very close to the mean (also called expected value); a high standard deviation indicates that the data points are spread out over a large range of values.The standard deviation of a random variable, statistical population, data set, or probability distribution is the square root of its variance. It is algebraically simpler though in practice less robust than the average absolute deviation.
Posts about Standard Deviation
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    … data (other than when specifically looking at search partner conversions and CPA). The second is to use Top vs. Other as much as you would use average position. This helps with the problem of not knowing the range and standard deviation. Average CPC How do you make bid changes? The traditional formula is to set your Max CPC to your desired cost…

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