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X= 
 Sum[(events[[i]] - f[x, a, b])^2/
  events[[i]], {i, 1, 40}]

I want to minimize X to find the value of a and b. How will i do it?

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    $\begingroup$ Look at FindFit, NonlinearModelFit, and related functions. $\endgroup$
    – Bob Hanlon
    Commented Aug 31, 2018 at 17:30
  • $\begingroup$ You're not using the usual chi-square statistic. The denominator ought to be the "expected value" which I assume is f[a, a, b] (with the observed counts being events). In other words, what happens when events[[i]] == 0 and f[x, a, b] > 0 ? $\endgroup$
    – JimB
    Commented Sep 13, 2018 at 13:13

1 Answer 1

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Do not write the function definition, write the real function and summation would also include x. Then use the function FindMinimum[X,{a,b}]

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