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Hi, 
 
I am a new user and I need help. 
 
My problem is that have some data(x,y) and I done a chart for them. 
 
However, I need to draw a curve which has this type: y=ax/(1+ax) and 
 
then I draw the erros. I don't know how I can implement this equation. 
 
Could someone help me? It is urgent for me. 
 
In the attachment image you can see what I want exactly. 
 
Thanks. 
 
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bevag 
 
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Ummm...you can rewrite the equation y=ax/(1+ax) as 
 
1/y = 1/(ax)+1 as long as you have no y=0 or x=0 points. 
 
Substitute y'=1/y, x'=1/x and you get y'=a'x'+1, with a'=1/a. 
 
Solve the linear equation with LINEST or a chart trendline. 
 
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Regards, 
 
Tushar Mehta 
 
www.tushar-mehta.com 
 
Excel, PowerPoint, and VBA add-ins, tutorials 
 
Custom MS Office productivity solutions 
 
In article <bevag.2cpfi5_1155852013.154@excelforum-nospam.com>, bevag.2cpfi5 
 
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