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Questions about Pareto Plot of Estimates

Jul 2, 2018 9:08 AM
(2812 views)

Dear community,

I have three short questions about Pareto Plot of Estimates.

1. How is t Ratio calculated?

2. How can I interpret t Ratio?

3. The solid black line is cumulative of t Ratio; however, how can I interpret this line?

Thank you!

9 REPLIES 9

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Re: Questions about Pareto Plot of Estimates

1. t ratio is the parameter estimate/ standard error of the parameter estimate.

2. t ratio is but one 'statistic' that can be used to evaluate the significance level of a given parameter estimate.

3. The curve is just the sum of the absolute values of the t ratio, it's main purpose is to give you an idea of the relative explanatory power of each estimate wrt to the others.

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Re: Questions about Pareto Plot of Estimates

Thank you for your reply.

Is it possible to change from t-ratio to estimated effect instead?

Sincerely,

TK

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Re: Questions about Pareto Plot of Estimates

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Re: Questions about Pareto Plot of Estimates

You would not want to use the estimated effect for the pareto because the effect is influenced by the scale of the x variables. For example, suppose temperature on a scale from 300 to 500 and pressure on a change from 1 to 2 are both in the model. If they have equal impact, the parameter for temperature must be much smaller because of the larger scale. The t ratio removes that effect.

Dan Obermiller

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Re: Questions about Pareto Plot of Estimates

I understand your points. However, are there any ways that I can see let say which parameter has the greatest effect?

Sincerely,

TK

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Re: Questions about Pareto Plot of Estimates

The Pareto Plot is one of the ways to assess statistical significance and decide which effects are not null. Examine the Parameter Estimates for importance. If the experiment was designed by JMP, then JMP saved a column property for each of the continuous factors called Coding. The estimates are based on the coded levels of the continuous and categorical factors. The estimates can be used directly to assess the magnitude of their associated effect.

Learn it once, use it forever!

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Re: Questions about Pareto Plot of Estimates

This script might be useful. It creates an Effects Plot.

Learn it once, use it forever!

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Re: Questions about Pareto Plot of Estimates

Thank you very much!

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Re: Questions about Pareto Plot of Estimates

Thank you for a very good effects plot.

Would it be possible to know which equation you use to calculate effects?

Sincerely,

TK