Extrapolation of a point on a graph/chart.

[ExcelCretin]

I have constructed a graph which consists of plots joined by a line (basic
line graph). How do i find the value of a point on that graph (if x = 0.37
then y = ?) other than printing the graph off and manually drawing the lines
myself? Any pointers would be most welcome!

 

[David Biddulph]

I have constructed a graph which consists of plots joined by a line (basic
line graph). How do i find the value of a point on that graph (if x = 0.37
then y = ?) other than printing the graph off and manually drawing the
lines
myself? Any pointers would be most welcome!

If you've fitted a straight line, use the LINEST function to get the
gradient and intercept of that line, and then use those coefficients to work
out the y value for your x value.

 

[ExcelCretin]

Thanks for the prompt response David, unfortunately I constructed a 'scatter'
with lines. does this make a difference?

 

[Tushar Mehta]

Use the LINEST function to get the coefficients in worksheet cells. For
more search the XL help for LINEST,

--
Regards,

Tushar Mehta
www.tushar-mehta.com
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