One of the assumptions for performing ordinal regression is linearity. How to test this for this specific type of regression? Do you have to use logit etc.? And how does this work in SPSS?

  • $\begingroup$ Do you mean "linearity" in terms of the relationship between the log-odds of the outcome and its predictors, or the proportional odds (or parallel regression) assumption, which can be assessed graphically or using dedicated test (e.g., Brant test)? $\endgroup$ – chl Nov 21 at 7:26
  • $\begingroup$ The first one, relationship between log-odds of the outcome and its predictors. I assume the latter is tested using the spss output of the ordinal regression analysis by looking at the test of parallel lines outcome? $\endgroup$ – Chris Nov 21 at 8:26

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