Reference Trait Value

This field is used to specify the value of the event variable that specifies the reference category.

Note: The reference variable must be a nominal variable.

By default, the first ordered category is designated as the value of the reference.

To Specify a Reference Trait Variable:

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Type the value indicating the reference in the text box.

For example, in a trait variable for disease status where “1” indicates diseased and “2” indicates healthy:

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Type 2 in the text box, as shown below:

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If you change your mind and would like to reset the field, click Clear.