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- Calculate Effect Sizes Add-in

May 20, 2016 11:28 PM
(3564 views)

This add-in ingests estimates from an ordinary least squares report (produced by Fit Model) and saves a table of model effect estimates, F-ratios, p-values, and three measures of effect size as formula columns (** Eta Squared, Partial Eta Squared, Omega Squared)**. If pairwise analyses are present with 'Ordered Difference' reports available, a combined data table of estimates including pairwise effect sizes (

**Instructions **(after installing add-in):

- Fit an ordinary least squares model using Analyze > Fit Model
- Go to Add-Ins > Calculate Effect Sizes > From Least Squares Report (Fit Model)

- If more than one least squares report is open, a dialog will appear to select which analysis to use

For models with a categorical factor:

- If pairwise analyses (e.g. Student's t-test) and "Ordered Differences' reports are available, Cohen's d for available pairwise effects will be calculated and saved to a combined data table
- If no pairwise analyses have been produced (or "Ordered Differences' reports have not been produced) a prompt will appear to add these analyses and calculate these effect sizes.

**Output: **

- Table of model effects and effect sizes

- If available, table of pairwise effect sizes

- Overall model statistics are saved to tables as table variables.

**Statistical Notes:**

- This add-in provides estimated effect sizes for ordinary least squares models (models with random effects are not supported)
- Effect Sizes Produced:

**Model Effect Sizes:**

*Eta Squared*

*Partial Eta Squared*

*Omega Squared***

- Negative values of omega squared are possible and are automatically set to 0

**Pairwise Effect Size:**

*Cohen's d*

**Update History**

- v0.03 - Added Cohen's d calculation for pairwise differences, and dialog to produce pairwise analyses if not present
- v0.04 - Added code to suppress prompt to add pairwise comparisons for models without categorical factor
- v0.05 - Fixed defect for running on Windows (Fit Least Squares reports were not detected). Added support dialog for selecting from available Least Squares reports:

Comments

05-26-2016
11:32 AM

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05-26-2016
11:32 AM

05-26-2016
01:16 PM

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05-26-2016
01:16 PM

05-26-2016
02:02 PM

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05-26-2016
02:02 PM

05-26-2016
02:51 PM

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05-26-2016
02:51 PM

This is Great! It's easy enough to calculate these by hand, but its even easier to have it calculated automatically! I also love that it includes Eta^2, Partial Eta^2 and Omega^2.

For those who are not familiar with these can also see how they're calculated but right clicking the column and selecting "Formula"!

07-09-2016
02:31 PM

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07-09-2016
02:31 PM

Thanks for this add-in, this is extremely useful. And being able to see the actual formula used is indeed a great plus.

Do you have any plans for creating a effect size add-in that also works with repeated measures or mixed models? This would be quite valuable, especially when using JMP for teaching to non-statisticians - I just discovered your repeated measures add-in, and having a way to produce effect sized more easily for repeated measures and mixed designs would be a great plus.

07-18-2016
01:53 PM

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07-18-2016
01:53 PM

07-18-2016
03:04 PM

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07-18-2016
03:04 PM

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- student's t-test
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