I am trying to run a multinomial logisitic regression and I am at the dialog box in SPSS 19 where it asks me to input my dependent, my factors, and my covariates. I have been looking everywhere for a good definition to indicate which of my variables are my factors and which are my covariates, but I am confused. here are examples of what I found:

Multinomial Logistic Regression: This is used to determine factors that affect the presence or absence of a characteristic when the dependent variable has three or more levels. In the dialog box, you select one dependent variable and your independent variables, which may be factors or covariates. The dialog box has the following submenus:

In SPSS, non-metric independent variables are included as “factors.” SPSS will dummy-code non-metric IVs.

In SPSS, metric independent variables are included as “covariates.” If an independent variable is ordinal, we will attach the usual caution.

In SPSS, metric independent variables are included as “covariates.” If an independent variable is ordinal, we will attach the usual caution.

Metric data is any reading which is atleast at an interval scale. As opposed to Non Metric data which can be nominal or ordinal.

Ex: weight, height, distance, revenue, cost etc., all of them are interval scales or above. Hence they are metric data.

On the other hands, satisfaction ratings, Yes/No responses, Male/Female readings etc., are Non Metric Data.

Read more: http://wiki.answers.com/Q/What_is_definition_of_metric_data#ixzz1f8aQXOlA

Ex: weight, height, distance, revenue, cost etc., all of them are interval scales or above. Hence they are metric data.

On the other hands, satisfaction ratings, Yes/No responses, Male/Female readings etc., are Non Metric Data.

Read more: http://wiki.answers.com/Q/What_is_definition_of_metric_data#ixzz1f8aQXOlA

[AgeRange=0]

[AgeRange=1]

[AgeRange=2]

[AgeRange=3]

[AgeRange=4]

[AgeRange=5]

[Income=1]

[Income=2]

[Income=3]

[Income=4]

[Income=5]

[Income=6]

[OwnEducation=1]

[OwnEducation=2]

[OwnEducation=3]

[OwnEducation=4]

[Gender=1]

[Gender=2]

[MontherEducation=1]

[MontherEducation=2]

So just let me verify (because by explaining it here I think I understand it better): Are all of my 5 variables ordinal? The age, income, and educations are all lists (i.e: 18-24, 25-34, etc). If so they are all Factors and I have no covariates, right?

Thanks. I'm also posting this to help future searchers with this dilemma.

Edit: If this is in the wrong sub-forum please feel free to move it