Model Specification Options | JMP 13.2

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Fitting Linear Models • Model Specification • Model Specification Options

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Model Specification Options

The red triangle menu next to Model Specification includes the following options:

Center Polynomials

Causes any continuous term involved in an effect with degree greater than one to be centered by its mean. This option is checked by default, except when a term involved in the effect is assigned the Mixture Effect attribute or has the Mixture column property. Terms with the Coding column property are centered midway between their specified High and Low values.

Centering is useful is making regression coefficients more interpretable and in reducing collinearity between model effects.

Informative Missing

Selecting this option provides a coding system for missing values. This system allows estimation of a predictive model despite the presence of missing values. It is useful in situations where missing data are informative. See Informative Missing for more details.

This option is available for the following personalities: Standard Least Squares, Stepwise, Generalized Regression, MANOVA, Loglinear Variance, Nominal Logistic, Ordinal Logistic, Proportional Hazard, Parametric Survival, Generalized Linear Model, and Response Screening.

Set Alpha Level

Sets the alpha level for confidence intervals in the Fit Model analysis. The default alpha level is 0.05.

Save to Data Table

Saves your Fit Model launch window specifications as a script that is attached to the data table. The script is named Model. When a table contains a script called Model, this script automatically populates the launch window when you select Analyze > Fit Model. (Simply rename the script if this is not desirable.)

For details about JSL scripting, see the Scripting Guide.

Save to Script Window

Copies your Fit Model launch window specifications to a script window. You can save the script window and re-create the model at any time by running the script.

Creates a SAS program that can re-create the current analysis and data table in SAS in a script window. Once created, you have several options for submitting the code to SAS.

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Copy and paste the code into the SAS Program Editor. This method is useful if you are running an older version of SAS (pre-version 8.2).

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Select Edit > Submit to SAS.

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Save the file and double-click it to open it in a local copy of SAS. This method is useful if you would like to take advantage of SAS ODS options, such as generating HTML or PDF output from the SAS code.

See the Submit SAS Code in the Using JMP book.

Submits code to SAS and displays the results in JMP. If you are not connected to a SAS server, prompts guide you through the connection process.

See the Submit SAS Code in the Using JMP book.

Convergence Settings

Depending on the model choice, the Convergence Settings menu includes the following options:

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Maximum Iterations

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Convergence Limit

Default values for the Maximum Iterations and Convergence Limit are 100 and 0.00000001, respectively. You can click on these values to enter new values for these limits. If you have a very large data set or a complicated model, you might want to limit the number of iterations. If your model does not readily converge, you might want to either increase the Maximum Iterations or increase the Convergence Limit.

Note: This option appears only for certain personalities or if REML is selected as the method in the launch window.

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Help created on 9/19/2017