Fwd: RE: AI-GEOSTATS: application of spatial staistics

[correa sandra]

Note: forwarded message attached.

---

Do you Yahoo!?
Yahoo! SiteBuilder - Free, easy-to-use web site design software

--- Begin Message ---

Hi Sandra

 

Sorry I don't have original email of first correspondant - could you please send a copy on?

 

I would also recommend trying out statistical clustering techniques (finite mixture models). These are often used for an environmental domain analysis, and can be spatially implemented. There is a recent article by Cajo Ter Braak in Ecological Modelling journal 2003 (I think). If you are interested I will dig out the reference when I return to my office next week.

 

A kriging technique would smoothly interpolate between points, whereas a mixture model approach would allow you to predict presence/absence for different types of environment. With just 31 sites, though, this may be a bit tricky.

 

Sama

 

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of correa sandra
Sent: Tuesday, 2 September 2003 7:46 AM
To: Adrian Martinez Vargas; [EMAIL PROTECTED]
Subject: Re: AI-GEOSTATS: application of spatial staistics

 Hi Adrian:

As I understand you have 31 samples of the same stratigraphic unit. I suppose that you have 30 genera within at least 300 organisms for each sample? So you really have more data than you think… Since you have 30 genera those will be 30 variables around the study area.

May be it will depend on what kind of analysis are you planning. I think it will be interesting using kriging indicator with categorical variable. Every genera will be one variable and you can get the distribution for each genera. This can be done with the GSLIB package.

Hope this helps.... 

Sandra Correa

ITESM

Mexico

Adrian Martinez Vargas <[EMAIL PROTECTED]> wrote:

It is preferable to use another data, I think that it is to spaced an in
these area exist many geological formation ware foraminiferous must change.
In internet exist more paleontologycal information, but exist more
information free about environment, geomorphology and other, search in SGS
Web.



King regards

Adrian Martínez Vargas

Departamento de Geología

ISMM, Las Coloradas s/n

Moa, Holguín Cuba

[EMAIL PROTECTED]

[EMAIL PROTECTED]

www.geocities.com/adriangeologo/adrian.html



----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, August 29, 2003 11:00 PM
Subject: AI-GEOSTATS: application of spatial staistics


> Hello,
> I currently am doing a statistics specialization and I wish to apply
spatial
& gt; statistics in my thesis.
> I have a data set with the following characteristics:
>
> 1)A very large area of study: from Panama to Ecuador over Pacific Ocean.
> 2)I have only 31 sampling points each with 30 discrete variables: counts
> of 30 genus of planktonic foraminifera found in each perforation(
drilling).
>
> I would like to know if are there methods in spatial statistics
> I can apply to data sets with these characteristics?
>
> Do I need to project my dataset in another coordinate different to
latitude
> and longitude?
>
> Thank in advance
>
> Carlos H. Cuartas O.
>
>
>
> ________________________________________
> Acceso rápido a Internet con Epm.Net http://www.epm.net.co
>
>
>
> --
> * To post a message to the list, send it to [EMAIL PROTECTED]
> * As a general service to the users, please remember to post a summary of
any useful responses to your questions.
> * To unsubscribe, send an email to [EMAIL PROTECTED] with no subject and
"unsubscribe ai-geostats" followed by "end" on the next line in the message
body. DO NOT SEND Subscribe/Unsubscribe requests to the list
> * Support to the list is provided at http://www.ai-geostats.org
>




--
* To post a message to the list, send it to [EMAIL PROTECTED]
* As a general service to the users, please remember to post a summary of any useful responses to your questions.
* To unsubscribe, send an email to [EMAIL PROTECTED] with no subject and "unsubscribe ai-geostats" followed by "end" on the next line in the message body. DO NOT SEND Subscribe/Unsubscribe requests to the list
* Support to the list is provided at http://www.ai-geostats.org

---

Do you Yahoo!?
Yahoo! SiteBuilder - Free, easy-to-use web site design software



___________________________
Disclaimer

This e-mail, including attachments if any, has originated from a Queensland government agency and may contain information that is confidential, or covered by legal professional privilege, and is intended for the named recipient(s) only. If you have received this message in error, you are asked to inform the sender as quickly as possible and delete this message and any copies of this message from your computer system network.

Any form of disclosure, modification, distribution and/or publication of this e-mail, including attachments is prohibited. Unless otherwise stated, this e-mail, including attachments represents the views of the sender and not the views of the Environmental Protection Agency.

Although this e-mail has been checked for the presence of computer viruses, the Environmental Protection Agency provides no warranty that all possible viruses have been detected and cleaned. Any use of this e-mail could harm your computer system.
___________________________

--- End Message ---