There is a very common metric used in statistics called the coefficient of variation. It's the standard deviation divided by the mean (sd/mean) and it is a very good measure of dispersion since it normalizes the standard deviation. Well guess what, Nzero is nothing more than the square of this very commonly used metric. That is, Nzero=CV^2=sd^2/mean^2. IMHO, below is a nice interpretation of Nzero. There is a massive body of statistical work about manufacturing processes and measures that express when a manufacturing process is in control or out of control, so that number of defects per units made estimation and minimization can be done. I guess in manufacturing, SCV, the square of the coefficient of variation (Nzero in Black Jack circles) would get a lot of interpretation and treatment as a metric, and this can probably be leveraged in AP circles to get a good handle on ROR for various casino games besides just black jack and that is where my interest in further reading stems from. So in a nutshell Nzero seems to be sparsely alluded to in gambling, but in reality it is very common in manufacturing and so there is actually a lot of stuff you can learn from it, by looking at the huge body of work about it in manufacturing and then hopefully applying it to AP stuff.
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