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Charley --

I admit I'm very light on the higher statistical concepts.

Me too! I took a deep breath before venturing into this discussion -- I figure that sooner or later some of those who understand this stuff will take over.

How can the SD change from 24.77% using the "standard" method to about 19% using Ln.

Well, the 19% is the antilog of the SDs of the logs. So it's some sort of "geometric SD". Beats me what that means -- maybe it's times/divided-by 1.19 rather than plus/minus 19%.

Probably those who understand doing elementary statistics with log-converted numbers can help us here.

Dave Goldman
Portland, OR
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