How to Analyze and Graphically Present Longitudinal Data - PowerPoint PPT Presentation

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How to Analyze and Graphically Present Longitudinal Data

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    1. How to Analyze and Graphically Present Longitudinal Data Ayumi Shintani, Ph.D., M.P.H. Department of Biostatistics Ayumi.shintani@vanderbilt.edu

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    20. Mathematical Presentation of Correlation Structures Let rjk donates a correlation coefficient between the jth and kth repeated measures on the same patients.

    21. Model for the correlation Independence (called Scaled Identity in SPSS)

    22. Model for the correlation (cont.) Exchangeable (compound symmetry)

    23. Model for the correlation (cont.) Unstructured

    24. Model for the correlation (cont.) Auto regressive (1)

    26. Selection of correlation structure If the number of repeats is small and data are balanced and complete, then an unstructured matrix is recommended