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Help! Complex samples Cox regression (multiple rows per subject)

  • 1.  Help! Complex samples Cox regression (multiple rows per subject)

    Posted Wed March 31, 2021 12:34 PM
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    I am wondering whether anyone can help me. I need to run a Cox regression but my data has multiple rows per subject and therefore I think it needs to be a complex cox regression.

    I would like to see which covariates (scores on test1- test20) contribute to whether an event occurs.
    Event: 0= didn't occur, 1= did occur
    Time to event: For those for which the event didn't occur I put the end of the study (120 months). If the event did occur then the time to event is be 12, 24, or 48 months.

    I have found information online to suggest that I need to change the format first (maybe similar to wide => long). But I am struggling to understand what exactly to do because my dataset seems different to the ones with an example (page 274 on - http://www.sussex.ac.uk/its/pdfs/SPSS_Complex_Samples_17.0.pdf)

    I have attached the first few rows of my dataset. I would really appreciate help with how to format the data and prepare the analysis plan.

    Each subject had multiple visits (but they all had a different number- minimum 2, maximum 6).

    Thanks in advance!

    ------------------------------
    Kate Harros
    ------------------------------

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    Attachment(s)

    xlsx
    Example for Cox regression.xlsx   11 KB 1 version