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http://www.openoffice.org/issues/show_bug.cgi?id=113105
                 Issue #|113105
                 Summary|Calc: mayer chart (statistique) wrong result
               Component|Spreadsheet
                 Version|OOo 3.2
                Platform|Unknown
                     URL|
              OS/Version|All
                  Status|NEW
       Status whiteboard|
                Keywords|
              Resolution|
              Issue type|DEFECT
                Priority|P3
            Subcomponent|code
             Assigned to|spreadsheet
             Reported by|rene





------- Additional comments from r...@openoffice.org Mon Jul 12 22:24:25 +0000 
2010 -------
[ I still see it in (vanilla) m84 ]

>From http://bugs.debian.org/588471:

--- snip --
I'm start to use statistic in my school, my teacher said me my result are wrong 
I show him My result and surprise he confirm OpenOffice Wrong Result for the    
+exercice !                                                                     
Ms Office works well, and manual resolution confirme Ms office result.          
                                                                                
look the array below                                                            
0       1       2       4       6       10                                      
76      67      59      46      35      20                                      
                                                                                
Insert diagramme based on that data                                             
Choose the lines one                                                            
- 0, 1, 2, 4 on the bottom chart's                                              
- 0 to 80 on the left                                                           
right-click on the shape to choose 'Inserez une coube de valeur moyenne' (Yes   
+it's the french version)                                                       
        (i don't know the english sentense)                                     
and check-in :                                                                  
- Afficher l'équation                                                           
- Aficher le coeficient de détermination (R2)                                   
                                                                                
You'll see :                                                                    
- f(x)= -11,1142[...]+89,4                                                      
- R2=0.989                                                                      
                                                                                
_BUT_                                                                           
- f(x) sould be -5.5[....] + 71,80                                              
- the shape does not cross the ordinate (Oy) at ~17,8 or 89,9 but               
+approximatively at 86 !                                                        
--- snip ---

Cédric thankfully translated the french and added some comment. I can confirm
this, too (use the first line):

--- snip ---
He meant, do the following steps:                                               
 * Select all the data                                                          
 * Click "Insert > Chart" menu                                                  
[...]
 * Select the "Line" chart type and keep the default options                    
 * Click "Next >>"
[...]
 * Select "Data series in rows"                                                 
[...]
  * Click "Insert trend line" in the context menu                               
[...]
  * In the "Type" tab, check                                                    
    * "Show equation"                                                           
    * "Show correlation coefficient (R2)"                                       
[...]
Oh, I have the trend line added and its equation and they fit what is in        
the bug report.                                                                 
                                                                                
However, I reproduced the very same procedure on Excel 2007 and I got           
the same results... I suspect that there is either something forgotten          
in the bug report or something done differently in Excel...  
--- snip ---

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