[R-sig-eco] multiple regression analysis

[Chris Howden]

U might want to look into kriging and co-kriging.

>From memory (and it's been awhile, I did this in my honours year) they
should help u get the 2 dimensional equivalent of standard time series
'lag' correlation charts. That way U can have a look at the spatial
correlation.

Who knows, someone may have thought up a 3-d equivalent so u can also
incorporate depth as well.

Chris Howden
Founding Partner
Tricky Solutions
Tricky Solutions 4 Tricky Problems
Evidence Based Strategic Development, IP development, Data Analysis,
Modelling, and Training
(mobile) 0410 689 945
(fax / office) (+618) 8952 7878
chris at trickysolutions.com.au

-----Original Message-----
From: r-sig-ecology-bounces at r-project.org
[mailto:r-sig-ecology-bounces at r-project.org] On Behalf Of Matevž Pavlic
Sent: Tuesday, 9 November 2010 5:05 AM
To: r-sig-ecology at r-project.org
Subject: [R-sig-eco] multiple regression analysis

Hi all,



This is more a help on ideas that on actuall R code. Those of you which
are geologist or work with boreholes woudl understand that i would like to
achieve.



I'll try to explain as good as I can...so here it goes..



I have around 1000 geomechanical (geological) borehole logs in a database.
The logs contain staial info, lithology and some laboratory data. My
initial goal is

compare the boreholes that are closer together (ie.e closer that 50
meters) to see if they are similiar lithologicaly. I thought maybe this
can be done with some kind of multiple

regression analysis where one would test if layers (ie. Clayey layer in
Bhole 1 in depth 5m and in Bhole2 this layer is in depth 7 meters) are in
same depth and if geology on

that depth is the same in Bhole1 as in Bhole 2. For example if boreholes
would  have similiar lithology on similar depth that the regresion R^2
would be 1 and if not that it would be less than 1.

This is of course my idealized way of approaching the problem. The idea is
to get a general a feel for the heterogenity of the changing geology (in
depth profile) over and area and to create a map

of heterogenity of geology of the observed area. Does any of this make
sense are i am way off?



Any ideas and/or experiences with such a problem is greatly appreciated,

Regards, m










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