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Can someone help me write out this equation for chi-square please

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Kelley Kehoe
Kelley Kehoe 2020-10-19
评论： Kelley Kehoe 2020-10-19
I am having trouble writing this equation out in matlab, am a beginner. This is my attempt so far: CS= sum(((y-m)./err_y).^2). Any help would be much appreciated!

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回答（1 个）

Alan Stevens
Alan Stevens 2020-10-19
As long as y, m and err_y have the same number of elements then your expression should work ok.
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Alan Stevens
Alan Stevens 2020-10-19
It is reasonable that the better fitting model produces a smaller value of chi-squared.
Your expression for chi-square looks somewhat unusual to me
(see https://www.statisticshowto.com/probability-and-statistics/chi-square/ for example), however, I'm no statistics expert.
Kelley Kehoe
Kelley Kehoe 2020-10-19
yes it is somewhat irregular, this is an assignment for class the equation differs slightly.

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