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Thread: regression for ordinal data?

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    regression for ordinal data?




    Hi All,

    I am looking at data showing injury to intervertebral discs. Injuries are graded on a 4 point scale with 0 being no damage and 3 being maximum damage. What we seeing is that when there is an injury at one disc, there seems to be an injury in the proximal disc.

    What we are trying to do is predict the injury grade to the proximal segment from the that of the initial segment.

    If the data was continuous, I would be able to run a regression but this is ordinal data. What is the best approach to do this considering this is ordinal data?

    Thank you very much in advance!

    Mac

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    Re: regression for ordinal data?

    Are you familiar with logistic regression? There should be a form of regression (ordinal rgression) that is similar you can use.

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    Re: regression for ordinal data?

    ordered logistic regression seems right.
    "Very few theories have been abandoned because they were found to be invalid on the basis of empirical evidence...." Spanos, 1995

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    Re: regression for ordinal data?


    Presumably there will be more than one disc per subject? My first thought would be an ordinal mixed model. These can be run in R with the ordinal package.

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