Re: Geometric mean and std. dev. on 12C or 12CP Message #2 Posted by Norris on 11 Dec 2006, 5:31 p.m., in response to message #1 by MK
I doubt it.
It is possible to calculate the geometric mean, if you have the product of all the entered values. However, the 12C calculates and stores the summation of the entered values, not the product.
In theory, it should not be difficult to calculate geometric means and geometric deviations on the 12C. Instead of the sigma-plus key, you could substitute a simple programmed function that would first calculate the natural log, then enter the log-transformed value into the stats registers via sigma-plus.
When all of the log-transformed values had been entered, you could calculate the mean or s.d. of the log-tranformed values as usual. Then take the antilogs to get the geometric mean or geometric deviation.
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