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Trend lines in charts under Excel



 
 
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  #1  
Old March 23rd, 2010, 02:55 PM posted to microsoft.public.excel.charting
cloclo[_2_]
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Posts: 1
Default Trend lines in charts under Excel

Something I have discovered for long but which continues with Excel
2007 (under XP): when you draw a trend line in a scatter or line chart
I generally get either not the best fit (or equation) and/or almost
sytematically the wrong equation associated to this trend line.

Has anybody seen that already and moreover knows why it is like that?
Surprising from a company like Micosoft.
  #2  
Old March 23rd, 2010, 08:13 PM posted to microsoft.public.excel.charting
Mike Middleton[_2_]
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Posts: 90
Default Trend lines in charts under Excel

cloclo -

Please provide an example.

In my experience, Excel trend line provides best fit for a linear function
in an XY (Scatter) chart type.

For non-linear functions, the trend line is based on transforms of the
original data, and often you could obtain a better fit using Solver to
search for function parameter values.

For a Line chart type, the trend line uses 1,2,3,... for the X values of the
fitted equation, ignoring any numerical values you may be using as labels
for the horizontal axis.

- Mike
http://www.MikeMiddleton.com


"cloclo" wrote in message
...
Something I have discovered for long but which continues with Excel
2007 (under XP): when you draw a trend line in a scatter or line chart
I generally get either not the best fit (or equation) and/or almost
sytematically the wrong equation associated to this trend line.

Has anybody seen that already and moreover knows why it is like that?
Surprising from a company like Micosoft.


 




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