🚀 go-pugleaf

As a matter of curiosity (since I don't deal in ppm scales) and to
extend the "platform" question, I tried to replicate the STDEV results
on an SE running Excel 4.0, no FPU.  I found discrepancies beginning
roughly at the point that the interquartile range falls below
one 10-millionth of the mean.  Apparently the precision has tightened
up a bit (no pun intended, but there it is) vis-a-vis 3.0, but the
formula is as before.

There is a LINEST function in 4.0 that returns multiple regression
statistics very fast and very accurately for most data, but I was
able to make it return an error value using data that other Excel 4.0
functions (determinant, matrix mult, etc.) are able to handle.

Unrepentant, I continue to trust Excel, for statistical purposes,
neither more nor less than anything else that comes shrink-wrapped.

(Flame deflectors on.)

Conrad Carlberg