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February 17th, 2008, 10:49 AM   #1
Joined: Dec 2007

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Exponential Regression Help Needed

Hi, I just got an assignment in which there is a list of points (about 20 points). I graphed these points on graphmatica and it resembled an exponential graph where the exponent is negative. I was wondering how to algebraically come up with an exponential graph to model these points.
Once again the only information I have is:

20 points
and that the exponent will be negative and the constant will be positive

eg. y = 2^(-x) or y = 123^(-5x) +222

Thanks in advance
elektriks is offline  
February 21st, 2008, 05:18 PM   #2
Joined: Feb 2008

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So whats the problem with modeling an exponential equation? What software do you use for your models?

If you have something like logger pro, you can just put in the 20 points, select the model you want to use (exponential, logarithmic, gaussian, etc) and it will give you an equation.

If you are having trouble visualizing this problem, just invert the expression:

5^(-5x) = 1/(5^5x)
indian is offline  

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