Don,

If the data is can be mapped as 2D or 3D Cartesian coordinates, you could
use spatial operators from PostGIS.

Rick


                                                                                       
                                                      
                      Don Isgitt                                                       
                                                      
                      <[EMAIL PROTECTED]        To:       Robert Fitzpatrick <[EMAIL 
PROTECTED]>                                       
                      om>                            cc:       PostgreSQL <[EMAIL 
PROTECTED]>                                     
                      Sent by:                       Subject:  Re: [real] [GENERAL] 
Outliers of data                                         
                      [EMAIL PROTECTED]                                                
                                                
                      tgresql.org                                                      
                                                      
                                                                                       
                                                      
                                                                                       
                                                      
                      10/21/2004 01:55 PM                                              
                                                      
                                                                                       
                                                      
                                                                                       
                                                      






Robert Fitzpatrick wrote:

>I have a project where it is necessary to determine Outliers of lab
>results and looking for some pointers on the best way to handle this
>type of calculation with PostgreSQL. Possibly an operator? I have no
>experience with that. I found some info on the web for calculating
>Outliers, here is one of them...
>
>http://cc.uoregon.edu/cnews/spring2000/outliers.html
>
>
>
Hi Robert,

You may want to consider the R language interface (pl/R); R (the
language) has great tools for detecting and operating on outliers.

Don


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