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Question regarding Proc capability tolerance interval non-normal distribution

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Occasional Learner
Posts: 1

Question regarding Proc capability tolerance interval non-normal distribution

Hello,

 

I am trying to compute tolerance interval using different types of statistical software. I believe proc capability can compute the tolerance interval. However, as I looked at the formula that computes the TI, it looks like it's assuming it is coming from a normal distribution. Can I compute tolerance interval from other distributions (ex. Logistic, Gamma, Poisson etc) using proc capability?

 

Thank you for all the help!

SAS Super FREQ
Posts: 4,237

Re: Question regarding Proc capability tolerance interval non-normal distribution

I think you are correct that the tolerance intervals in PROC CAPABILITY assume normality. I recall that the book by Hahn and Meeker (1991) contains more intervals, some of which are easy to implement. 

 

A previous thread asked about nonparametric tolerance intervals and mentions a SAS macro.

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