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lehaofeng
Level V

How to determine if it obeys a chi-square distribution?

I want to determine whether a set of data obeys a chi-square distribution, how do I do this with JMP? Thanks!
I looked at the distribution-continuous fit and didn't find this distribution.

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MRB3855
Super User

Re: How to determine if it obeys a chi-square distribution?

Hi @lehaofeng : The Chi-squared distribution is a special case of the Gamma distribution. 

Statistical Details for Continuous Fit Distributions (jmp.com)

So, you could start via trying to fit a Gamma distribution. If it doesn't fit a Gamma, then it can't be a Chi-squared. If, however, it is Gamma...then it might be Chi-Squared. Try that then come back. 

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2 REPLIES 2
MRB3855
Super User

Re: How to determine if it obeys a chi-square distribution?

Hi @lehaofeng : The Chi-squared distribution is a special case of the Gamma distribution. 

Statistical Details for Continuous Fit Distributions (jmp.com)

So, you could start via trying to fit a Gamma distribution. If it doesn't fit a Gamma, then it can't be a Chi-squared. If, however, it is Gamma...then it might be Chi-Squared. Try that then come back. 

lehaofeng
Level V

Re: How to determine if it obeys a chi-square distribution?

Thanks. I'll look into it.

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