Charting question

wenlianglo

New Member
Joined
Mar 4, 2009
Messages
9
How do I extrapolate a graph which do not have a formula for the graph?
At the end of the graph, I found that I don't have enough data and would want to have a longer graph?
 

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I used "scatter with smooth line".
If I add trend line "polynomial", that ignore some of my data which makes it inaccurate.
 
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FORECAST is based on linear function, so my scattered graph if forecasted will have straight lines at that part.
Any other suggestion?
 
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