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- Calculate Exact Confidence Interval Numbers

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Mar 19, 2013 5:55 AM
(2573 views)

Sorry for the basic questions -- trying to figure out JMP. I have scoured the manuals but can't seem to find the answer.

I have the fit below -- with the 95% individual confidence intervals turned on. I am trying to calculate the exact numbers, i.e. @ Y=.60 what is the lower line X value.... it is close to X=.005. I need to be able to calculate it for any Y value -- similar to how the inverse predictor works. Please let me know if you need any more info...

Thanks in advance

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Mar 19, 2013 10:07 AM
(4497 views)

1. Instead of Fit Y by X use Fit Model. In the Fit Model dialog you can specify the Log transform for "y axis" and "x axis" using the "Transform" red triangle pull down.

2. In the output window use the red triangle pull down next to "Response Log(y axis)" and choose Save Columns > "Indiv Confidence Limit Formula". This places formulas for the upper and lower 95% CL for Individuals in the table.

3. In JMP using the menus choose Graph > Profiler.

4. In the Profiler select the lower CL formula for "Y, Prediction Formula" and click OK.

5. In the resulting window click the red triangle pull down next to "Prediction Profiler" and choose "Desirability Functions"

6. Alt click the Desirability Function and change it to "Match Target" and then set the middle value to be your target (0.6 in your example

7. Click the red triangle pull down next to "Prediction Profiler" and choose Maximize Desirability

In your example you should be able to see the result (0.0048582) on the horizontal axis label and the achieved target (0.6) on the vertical axis.

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Mar 19, 2013 10:07 AM
(4498 views)

1. Instead of Fit Y by X use Fit Model. In the Fit Model dialog you can specify the Log transform for "y axis" and "x axis" using the "Transform" red triangle pull down.

2. In the output window use the red triangle pull down next to "Response Log(y axis)" and choose Save Columns > "Indiv Confidence Limit Formula". This places formulas for the upper and lower 95% CL for Individuals in the table.

3. In JMP using the menus choose Graph > Profiler.

4. In the Profiler select the lower CL formula for "Y, Prediction Formula" and click OK.

5. In the resulting window click the red triangle pull down next to "Prediction Profiler" and choose "Desirability Functions"

6. Alt click the Desirability Function and change it to "Match Target" and then set the middle value to be your target (0.6 in your example

7. Click the red triangle pull down next to "Prediction Profiler" and choose Maximize Desirability

In your example you should be able to see the result (0.0048582) on the horizontal axis label and the achieved target (0.6) on the vertical axis.

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Mar 19, 2013 12:42 PM
(2349 views)

Simply amazing... this not only answered my question, but gave me a bunch of little tips on navigating JMP. I feel I am severely under utilizing this program.