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I can fit my data with two exponential functions (I wanted to post an image but was not allowed as a new user). How can I fit the data with just one function? I tried a quadratic polynomial but that didn't fit too well.

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I think for us to be helpful you need to provide a more detailed description of your data and explain why you are looking for a specific single function. – Michael Chernick Aug 22 '12 at 16:39
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If you post a link to your picture, a user with sufficient reputation points can embed it in your question for you. – Macro Aug 22 '12 at 16:43
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It seems likely that some of these closely related questions are exactly what you have in mind, melipone: look among them for a good answer. If you don't find what you need, please return here and edit this question to explain what is different about your situation. – whuber♦ Aug 22 '12 at 16:49

closed as not a real question by gung, Andy W, Macro, whuber♦ Aug 23 '12 at 12:54

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.