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Let's say I have a bunch of points :

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What is the formula/topic which I should read - for finding equations by points ?

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It depends. Do you want the curve to go through all of the points or just be a good fit. What type of curve should the data behave like? –  Jp McCarthy Dec 2 '13 at 7:51
en.wikipedia.org/wiki/Interpolation and related topics –  alexjo Dec 2 '13 at 7:55
Given your particular example, a linear least squares fit would not be wholly unreasonable. –  J. W. Perry Dec 2 '13 at 7:55
Another relevant wiki page is the one about Curve fitting. –  achille hui Dec 2 '13 at 7:55
It looks like a logarithmic function would be a good fit, too. –  ijkilchenko Dec 2 '13 at 7:56

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