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I want to run a test in order to identify if there is any correlation between the length of in-hospital stay (Scale) and the kind of the procedure (Nominal with three options; abdominal, cardiac and other). Can you provide me with the right test from the Analyze menu in SPSS ?

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    $\begingroup$ Perhaps you should have a look at Correlation between a nominal (IV) and a continuous (DV) variable $\endgroup$ – Silverfish Dec 1 '14 at 22:35
  • $\begingroup$ In summary: we don't normally talk about "correlation" with a nominal variable, since there's no sense of "as X increases, Y increases" (how can X increase if it isn't ordered?). There are some analogous concepts you can apply to measure strength of association, such as eta-squared, but perhaps you are (or should be) more interested in effect sizes $\endgroup$ – Silverfish Dec 1 '14 at 22:38

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