See http://en.wikipedia.org/wiki/Logistic_function
If you need help implementing this in Excel, please come back.
best wishes
--
Bernard V Liengme
www.stfx.ca/people/bliengme
remove caps from email

"Cham" wrote in message
...
Putting together a presentation where I want to regularly refer to a graph
depicting the S curve. I would love to create this curve somehow in
excel.
I have tried unsucessfully. Your thoughts and suggestions are greatly
appreciated.