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MKaashoek
Level I

No Upper and Lower confidence limit from reduced major axis regression

Hi all,

 

For my data I wanted to perfom a reduced major axis regression. I've looked up the method and found the following steps in JMP: "Fit Y by X", click "Fit Ornthogonal", and then "Univariate Variances, Prin Comp"  (https://community.jmp.com/t5/Discussions/Reduced-Major-Axis-regression-in-JMP/td-p/71681#)

 

But for some of my data, the JMP output for the Fit does not give me a L CL and U CL and I was wondering why. Is it maybe because my sample size is to low? But in some cases with the same sample size it does give an L CL and U CL. Have any of you maybe got the same output and know why JMP does not calculate the U CL and L CL sometimes?

 

Thanks

4 REPLIES 4
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Byron_JMP
Staff

Re: No Upper and Lower confidence limit from reduced major axis regression

How low is low when your sample size is low?

 

JMP Systems Engineer, Pharm and BioPharm Sciences
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MKaashoek
Level I

Re: No Upper and Lower confidence limit from reduced major axis regression

In some cases its 5. But for some reduced regressions I made using 5 they were able to give a lower and upper confidence limit.

Could it be that in some cases the spread is to big between the 5 that it can't calculate the lower and upper confidence limit?

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j-perry
Level II

Re: No Upper and Lower confidence limit from reduced major axis regression

I have the same question. I'm not getting a confidence interval with 9 data points.

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Byron_JMP
Staff

Re: No Upper and Lower confidence limit from reduced major axis regression

would you mind posting a picture of the report in JMP?  Just want to make sure we are all on the same page.

JMP Systems Engineer, Pharm and BioPharm Sciences
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