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Thread: Intrarater reliability for continuous variable

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    Intrarater reliability for continuous variable




    I was hopeful for some advice on how to assess intrarater (not inter) reliability. My specific problem is 1 rater repeats a measurement on 20 subjects.

    Number of raters: 1
    Number of subjects: 20
    Number of observations per subject: 2
    Observation: Continuous variable (measurement) ranging from 0-200

    So far I am unsuccessful in finding a definitive answer

    My two specific questions:

    1) I am thinking the best test to use is Intraclass correlation coefficient (ICC). Agree?
    2) If ICC is used which one to use, one-way or two way?

    For example my thought was as follow for using icc from the irr package in R:

    data = subset (data, select=c(measure.1, measure.2))
    icc(data, model="oneway", type="consistency", unit="single")


    Any help is greatly appreciated

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    Re: Intrarater reliability for continuous variable

    Looking at your source code it appears that you have it correct. I think that the unit="single" is correct because it should give you a measure of absolute agreement. And, yes, it would be model="oneway".

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    Re: Intrarater reliability for continuous variable


    Very much appreciate your help!

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