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May 14, 2017 7:44 PM
(1518 views)

Hi All,

May i know what is the method that we can do in order to find the optimum mean from our DOE which has the lowest possible variation?

Rgrds

Irfan

18 REPLIES

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May 15, 2017 2:23 AM
(1509 views)

(I'm assuming that you have already collected your data).

You could view the second video (by Robert Anderson, '**Using historical production data to identify manufacturing process improvements**') at this link (SAS profile required). It uses observational data, but the mechanics of how to use JMP are the same.

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May 15, 2017 7:08 PM
(1485 views)

May i know what is the JMP version that Robert Anderson is using in his webcast?

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May 15, 2017 1:41 PM
(1490 views)

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May 15, 2017 6:17 PM
(1485 views)

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May 16, 2017 2:45 AM
(1478 views)

Myers et. al. give a good overview of simultaneously modeling mean and variance in this reference:

http://amstat.tandfonline.com/doi/abs/10.1080/00031305.1992.10475869?src=recsys

Essentially it's no different than modeling two responses...of course you'll need replication within your design to estimate the variance for each treatment combination. All the usual co-optimization, simulation tools in the Fit Model platform, for the specific modeling personality you choose, will come into play.

On the simulation side of things one path is within the JMP Prediction Profiler (which I assume you'd use, since you can fit a model of your experimental results) you can use the Simulator from the Profiler framework to assign target values for each predictor variable, distributional forms for each variable, and estimates of mean and variance for predictors. Add other sources of noise as you see fit. You can even run a simulated experiment with the assumed mean and variance for each factor setting within the Profiler...so lots of different ways to go at this from a simulation point of view.

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May 16, 2017 4:47 AM
(1470 views)

You can always used the log-linear variance model through the **Fit Model** dialog for this purpose. Change the fitting personality to **Loglinear Variance**. Then you define the linear predictor for the **Main Effects** (mean) and another for the **Variance Effects** as you normally would for a multivariate linear model. This way you also have a profiler for each. You can save the fitted models as column formulas and then use them in other platforms outside of the fitting.

You do not need replicates for this model, but they help. You do need a large number of degrees of freedom for the error.

Read more about it in **Help** > **Books** > **Fitting Linear Models**. Chapter 10 is devoted to this platform.

Learn it once, use it forever!

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May 16, 2017 8:33 PM
(1428 views)

Dear Mark,

Any webcast showing how to use the loglinear variance

Any webcast showing how to use the loglinear variance

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May 16, 2017 10:53 PM
(1424 views)

I don't know if we have a video demonstrating the Loglinear Variance Model but the documentation has a good example.

-Jeff

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May 17, 2017 6:54 PM
(1398 views)