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Re: Semi-log and log graphs - Leigh's response



At 09:52 3/11/98 -0500, Allen Brown wrote:
... the fitting
algorithm is based on mathematical principles. Attempting to do do a
linear fit on suspected exponential data that have been transformed by
logarithm violates the principles used - "maximum likliehood" I believe it
is - because the distribution underlying each data point is no longer
normal. On a semi-log plot, especially when uncertainties may be largish,
you can really see the effect of the skewing. The use of a least squares
algorithm is not just a matter of aesthetic choice.

Gee Leigh, it surprises me that you would say this because you are usually
such a stickler for detail, and this is not just a detail, but the basis
on which the procedure is carried out.
....
Allen


Allen's sensibilities may have been blunted by sorting the right
from the wrong.
On this list in the last few days we have been treated to a much rarer
kind of intellectual display: a reasoned debate between what's right
and what's right - where both of the positions being supported are
reasoned and have merit.
And here, Leigh is upholding such a position - in my view.

Whatcott Altus OK