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>Don't know the channel index, but a Z-score in statistics is essentially a
>calculation using population statistics to normalize a specific value or
>observation into a score to allow for lookup of the statistical probabilities
>of an event using a standard table.
>
>
>so... when somebody is talking about a value that is 3 standard deviations
>from the average, the z-score would be 3
>
>Nothing magical about it at all.
Nothing magical, but let's be precise. If the value is ABOVE the average
its z-score is 3. If the value is BELOW the average, then its z-score would
be -3
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