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Thread: Diagnostic accuracy of two methods tested on longitudinal data/repeated measurements

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    Diagnostic accuracy of two methods tested on longitudinal data/repeated measurements




    To compare two imaging rating methods in detecting growth (ordinal variable + , = , - ) we compared serial MRI's with both methods.

    We have for example an MRI after 6 months, 1 year, 2 year, 3 year, 4 year etc....
    We compare the MRI of 6 months with that of 1 year, that of 1 year with that of 2 year etc...
    Serial comparisons .... We do this with both imaging rating methods. We have two longitudinal sets of serial comparisons.

    Now we want to compare those two longitudinal serial comparisons with each other and prove which of two imaging rating methods detects growth faster or more accurate than the other one.
    Also we want to look which methods best predicts outcome.

    When reading literature it does not become clear which tests to use.

    we would be very grateful if anyone can help.

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    Re: Diagnostic accuracy of two methods tested on longitudinal data/repeated measureme

    Describe the outcome and with test comparison. What does it mean to compare 1 year to 2 year? Do they get a + for growth, - for shrinkage, = for no growth or shrinkage with an absolute difference greater than a threshold?
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    Re: Diagnostic accuracy of two methods tested on longitudinal data/repeated measureme


    Hi,

    Have a look at Bland-Altman plots with multiple measurements per subject- is this what you need?

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