find probability of chi2 test

Question

Mustafa Al-Nasser 2021-3-16

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https://ww2.mathworks.cn/matlabcentral/answers/774427-find-probability-of-chi2-test

回答： Aditya Patil 2021-3-29

采纳的回答： Ive J

Dear all;

if i want to perfrom a hypothesis test for chi2 distrubtion , how can i do it in matlab :

P(X>a)= alpha

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Mustafa Al-Nasser 2021-3-21

thank you Asvin

basically i need to test the following hypothesis

P(X> Chi2_Cirtical value)= alpha

Chi2_Cirtical value calcuated from central Chi2 distribution table , alpha is the signifacnce level

so, i need to check if the hypothesis hold if the above equatio is satisifed .

let us assume that Chi2_Cirtical value= 5.99 at alpha= 0.05 .at degree of freedom 2

in chi2gof. , i can specify the alpha but to specify the Chi2_Cirtical value , I need to know the degree of freedom.

if i use above function , i can got degree of freedeom , so since i know alpha i, i can check if the dgree of freedom > 2 , then X> 5.99 and my ypothesis is hold.

Is my conclusion is right?

Asvin Kumar 2021-3-21

Thanks for explaining. I'm, unfortunately, not the right person for this question. I was merely suggesting a function I had come across in the docs. I'll let someone else from the community help you with this.

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