Dear Group members Would you suggest any document on the use of the method MAXIMUM LIKELIHOOD to fit a model to experimental covariogram, preferably at a level...
1735
Dean Monroe
dean.monroe@...
Nov 1, 2004 10:17 am
Group: To add to my previous question, I have a continuous dataset of spectral readings from local crops. Under the idea of spatial continuity I would assume...
1736
Dean Monroe
dean.monroe@...
Nov 1, 2004 10:17 am
Hello Group: Being new to geostatistics I am unsure about the various types and modes of spatial analysis. Is there a way to determine the probability of...
1737
Isobel Clark
drisobelclark@...
Nov 1, 2004 10:18 am
Dean The semi-variogram function (if it reaches a sil at some point) is directly analogous to the covariance between samples given the distance (and possibly ...
1738
Jose Luis Gomez Dans
jgomezdans@...
Nov 3, 2004 4:56 pm
Hi all, I'm new to the list, so bear with me :) I'm trying to carry out some kriging of some (x,y,v) data set on to a regular grid. I have read some of the...
1739
marenostrum@...
Nov 3, 2004 4:56 pm
Dear Geostat I'm a beginner and I had the unliky case of a tridimensional multivariate geochemical dataset to start my geostatistical adventure...moreover data...
1740
Dan Bebber
danbebber@...
Nov 3, 2004 4:57 pm
It probably means that you have a spatial trend in your data. Remove any trend, then try again. Dan Bebber Department of Plant Sciences University of Oxford ...
1741
Isobel Clark
drisobelclark@...
Nov 4, 2004 8:40 am
Corinne The whole point (as I understand it) of using an indicator approach is to remove all question of what the original distribution was. All your sample...
1742
Dan Bebber
danbebber@...
Nov 4, 2004 8:40 am
Detrending is a pretty basic practice in geostatistics. I think you should do some more reading before you plunge into analyses. Dan Bebber ... ...
1743
corinne_danielli@...
Nov 4, 2004 8:41 am
Dear List: I am trying to build a porosity control map using a discrete log with 7 facies, using sequential indicator simulation. The lag size must be set ...
1744
Pierre Goovaerts
goovaert@...
Nov 4, 2004 8:41 am
Another explanation for this shape is that Jose is looking at the variogram for short distances. It is well known that for very continuous attributes, such as...
1745
Dan Bebber
danbebber@...
Nov 4, 2004 8:42 am
The classic example in Isaaks & Srivastava has a lot of data points. More data gives a better description of the process, but the problem is with computation:...
1746
Mark Coleman
mark@...
Nov 4, 2004 8:43 am
Greetings, I am coding some basic geostatistical procedures and was curious about the "typical" sorts of sample sizes researchers run into. I know that sizes...
1747
Dan Cornford
d.cornford@...
Nov 4, 2004 1:41 pm
Mark, this really depends on how you want to estimate the parameters of the covariance / variogram. If you want to use maximum likelihood, then due to the need...
1748
Isobel Clark
drisobelclark@...
Nov 4, 2004 1:41 pm
Mark Our free downloadable data sets range from 16 to over 20,000. The biggest set I worked wth was a small section of a South African gold mine - 450,000. ...
1749
meiyou
tibshirani@...
Nov 5, 2004 8:29 am
Hi there, Hope somebody can answer a newbie's question. Although it may be ill-conditioned, my question is, how can I compare the result of OLS model and a...
1750
Darla Munroe
munroe.9@...
Nov 5, 2004 8:30 am
Greetings, I was hoping I could query the community for some help with a paper I'm writing - I would appreciate your input on the following: 1) What...
1751
Koen Hufkens
koen.hufkens@...
Nov 9, 2004 8:34 am
Dear list, First I want to thank you all for the help you gave me last year. It resulted in a Master degree with honours! So, thank you for all the support,...
1752
Rajive Ganguli
rajive.ganguli@...
Nov 9, 2004 8:35 am
Koen, Some quick thoughts. Is it possible, you have a mixture of distributions in your data? It may be why when you combine many distributions (as in your...
1753
Gayle Hanssen
dms@...
Nov 9, 2004 8:36 am
Dear All I am involved in trying to find a solution for a gold mine in Zimbabwe. The veins are very thin (from 5cm to 4m) with grades from trace to 2.2% Au. ...
1754
Dan Bebber
danbebber@...
Nov 9, 2004 7:18 pm
By "do anything with the data", do you mean geostatistics or other statistics? If geo, how about transforming to a binary indicator, i.e. gold worth bothering...
1755
bob sandefur
rsandefur@...
Nov 9, 2004 7:19 pm
Hi- Without knowledge of the geometry of the veins the suggestion may be pretty silly, but if the veins occur in swarms which are combined for mining I would...
1756
Digby Millikan
digbym@...
Nov 10, 2004 8:01 am
MessageGayle, I can't give you any solution but can inform you of my past experience; - Gold deposits normally display skewed distributions, so that if the ...
1757
Mike Saunders
mike_saunders@...
Nov 11, 2004 11:52 am
I have been pondering this for some time. I am running a simulation experiment where I take 1000 sample plots each from point patterns of different...
1758
Afshartous, David
afshar@...
Nov 20, 2004 12:08 pm
Greetings, I have a 1000x1000 evenly spaced grid in matrix form, where each point represents the estimated intensity of a point pattern. I'd like to create a...
1759
ali qadrouci
qadrouci_ali@...
Nov 20, 2004 12:09 pm
Dear listers, I have a set of core drill data that have not the same length. So that for the variographic studies and the calculation of resources (using...
1760
Monica Palaseanu-Love...
monica.palaseanu-love...
Nov 20, 2004 12:10 pm
Hi, You should look into R and its packages .... it is the free version of S-PLUS. If you are used with the command window in S-PLUS then R should be quite...
1761
Olhede, Sofia C
s.olhede@...
Nov 23, 2004 2:55 pm
Apologies for any cross-posting - __________________________________________________ Dear Colleague, The purpose of this message is to announce a session at...
1762
Isobel Clark
drisobelclark@...
Nov 23, 2004 2:55 pm
Kai I would suggest you take a look at: Introduction to Geostatistics: Applications in Hydrogeology (Stanford-Cambridge Program) P. K. Kitanidis which is a...
1763
Colin Daly
Colin.Daly@...
Nov 23, 2004 2:55 pm
Kai There has been some work in this area there are some references at the Ecole des Mines, Centre de Geostatistique website .... see the papers by Anne Dong...
