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I have a datasheet. It looks like an hyperbola. How can I fit a curve to it? And how can I plot a curve of the first derivative?

Time (x)second  Normalized data (y)     0            100.00%  100            102.60%  200            104.39%  300            105.53%  400            106.80%  500            107.49% 1000            113.03% 1500            113.13% 2000            113.30% 2500            113.63% 3000            113.78% 3500            113.92% 4000            113.92% 
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    You use regression methods. But first, where did your data come from?2011-12-14
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    If I plot the data it looks more like two straight lines, one from 0-1000 sec, and one from 1000-4000 sec. Hyperbolas don't have that sharp a corner.2011-12-14

4 Answers 4