If it's that clear a feature, can you model it with a polynomial surface
and then subtract that from the data and work with the de-trended
residuals?
Tim Glover
Senior Environmental Scientist - Geochemistry
Geoscience Department Atlanta Area
MACTEC Engineering and Consulting, Inc.
Kennesaw, Geor
Agreed, except it isn't ONLY Unix - it IS only X-windows, but can be run
on Windows with an X-window client.
Tim Glover
Senior Environmental Scientist - Geochemistry
Geoenvironmental Department
MACTEC Engineering and Consulting, Inc.
Kennesaw, Georgia, USA
Office 770-421-3310
Fax 770-421-3486
E
The method (derived from one in USEPA
SW-846: http://www.epa.gov/epaoswer/hazwaste/test/pdfs/chap9.pdf
- good discussion on page 9-6) is designed to estimate the number of samples
from a homogeneous, normally-distributed population needed to determine if the
mean value of the population is
Here’s a good page about Dr.
Matheron that includes a photo.
http://www.annales.org/archives/x/matheron.html
Tim Glover
Senior Environmental Scientist - Geochemistry
Geoenvironmental Department
MACTEC Engineering and Consulting, Inc.
Kennesaw, Georgia,
USA
Office 770-421-3310
Fax 770
A resource we should all be aware of is
"StatLib---Applied Statistics algorithms
The Royal Statistical Society has been publishing algorithms in its
journal Applied Statistics since 1968. As of 1989, there are over 250 of
them. Most are in Fortran, though a few were in Algol, and some recent
ones
Title: Message
Have
you looked at the data to see if a log-normal population model is more
appropriate than a normal one? Do the very high values actually belong in
the data set or are they evidence of two different populations (for instance,
"background" and "contamination" or maybe "count
Well, well. I didn't expect to start such a tempest with my question!
Since I have a last name that many seem to mispronounce (using a long
"o" as in "glow" instead of the proper short "o" as in "love"), I should
have asked how D. Krige pronounced his last name.
I appreciate everyone's informati
Here's a somewhat esoteric question for those of you who've had direct
contact with the early giants in the field (on whose shoulders we now
stand):
What is the correct pronunciation of "kriging"?
I've heard it CREE-ging, CRIG - ing, CREE-jing, etc.
Tim Glover
Senior Environmental Scientist -
Usually when I've seen a "wavy" semivariogram, it's because of a local
feature superimposed over an existing field function - for instance, a
release of mercury in a field of soil with very low "natural" mercury
content. The period of the waviness is related to the distance across
the feature (the
Standard t-tests make two assumptions: 1. both data sets are normally
distributed; 2. they have approximately equal variance. Test these
assumptions before applying a t-test. Violate these assumptions at your
own risk. If you fail either assumption, you need to consider your
options, but probably
Thisa reminds me of a site where the "failure" of variogram modeling actually told me
quite a bit about the problem at hand. It was a large field where dumptruck loads of
soil with a contaminant had been dumped randomly and spread. This was unknown until
after a gridded set of samples had been
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