Sure Chuck. What I was talking about was a part of statistics that we in our gnat-hair-splitting compulsive group may forget about.
Let's assume that our 100,000 standards were carefully calibrated against THE standard. There is a small amount of error in the calibration process. Let us even assume that the error in the calibration process is normally distributed.
It is not impossible that for a sample of 100,000 secondary standards, that the errors would be all be off in the same direction, compared to the standard's value.
Now, granted, this would be a small probability indeed. But it is possible to toss a coin fifty times and have fifty "heads". The smart bet is that it won't.
Chuck Harris wrote:
That will only be true of primary standards. Secondary standards must be calibrated to some "primary standard". If all 100,000 of your secondary standards were calibrated to the wrong value, they will all have values that hover around that wrong value. -Chuck Harris
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