I am struggling to determine which regression method, if any, is most appropriate for my data.

Does anyone have any suggestions? I am using SPSS.

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- I considered MULTIPLE REGRESSION, which would require me to treat my total score for the outcome variable as a continuous variable, which I know is debatable. However, my stats book says the outcome variable needs to be unbounded, so I am assuming I would violate that assumption since my variable would be bounded (scale ranges from 30-150, but data scores only range from 38-145)

- I am also considering ORDINAL LOGISTIC REGRESSION, perhaps by binning the total scores of my outcome variable.

- Another possibility I am exploring is CATEGORICAL REGRESSION (CATREG in SPSS), which uses the Optimal Scaling approach.

Thoughts? Guidance? Need more info?

Thanks!

Scott