Ordinal regression is a model for a response variable which is a category taken from an ordered set of possibilities
(for example: absent, slight, moderate, severe). The menu allows for data to be entered in 2 forms: either in a single
factor or within multiple variates.
Available Data
This lists data structures appropriate to the current input field. The contents will change as you move from one field
to the next. Double-click on a name to copy it to the current input field; alternatively, you can type the name directly
into the input field.
Form of response
Specifies the form of the response data. You can choose between having a single factor containing the observations or multiple variates.
Response Factor
Specifies a factor containing the observations (response).
Responses
Specifies a list of variates containing the responses.
Maximal Model
This allows you to specify the most complicated model that you are likely to want to consider in your analysis. This field
may be left blank, but this may lead to subsequent inability to compare models because of data that are missing for some
explanatory variates but not for others.
Model to be Fitted
The terms to be fitted to the model are specified by entering a model formula. You can investigate other models by using
Change Model to add or drop terms. If you specified a maximal model, all new terms must have
appeared in that model. If you did not specify a maximal model and a term is introduced with a missing value for a unit
previously used in the regression, the model sequence is interrupted and information will be available only for the current
model (excluding that unit) and the new model.
Link Function
Lists the available link functions.
Operators
This provides a quick way of entering operators in the Model Terms formula. Double-click on the
required symbol to copy it to the current input field. You can also type in operators directly. See
model formula for a description of each.
See Also