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The exponential fit in Excel isn't really doing what I want it to do (the fitted exponential is clearly upside-down in the first graph) and I was wondering if there was an easy way to fix this or an explanation as to why it won't fit it the way I would like it to.

I had a quick fix which involved transforming the data (the second graph).

Graphs and data

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  • "negative exponential" is called log:) – Máté Juhász Apr 25 '17 at 16:53
  • @MátéJuhász ln(x) is the inverse of e^x. What I am talking about is something like -e^(-x) – Curtis Apr 25 '17 at 17:07
  • You can use Excel solver to fit, say, y=a-b*exp(c*x) to the data. – g.kov Apr 25 '17 at 17:15
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    The log fits perfectly your data – fernando.reyes Apr 25 '17 at 17:18
  • @fernando.reyes that's not the method of fit that I want though, seeing as it is a first order system, I know that it should be an exponential not a logarithm. – Curtis Apr 25 '17 at 17:24

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