# Setting the base outcome of a categorical outcome variable

If an outcome variable represents category data, and a multinomial logit model is used, it is necessary to specify one of the categories as a “base outcome” in order to estimate the model. The coefficients associated with the base outcome are zero by construction, and all other coefficients are relative to the coefficients of the base outcome. By default, the first category is treated as the base outcome.

To set the base outcome of an outcome variable:

1. In the Model view, select the outcome variable whose base outcome you wish to set
2. Choose Model > Outcome Variable > Base Outcome, and select the desired base outcome

See also:

- Treating an outcome variable as categorical data
- Specifying the omitted category of a categorical explanatory variable
- About models

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