Longitudinal data analysis is an essential statistical approach for studying phenomena observed repeatedly over time, allowing researchers to explore both within-subject and between-subject variations ...

Inappropriate choice of working correlation structure in generalized estimating equations (GEE) could lead to inefficient parameter estimation while impractical normality assumption in likelihood ...

The Proposal Design and Methods (PDM) service provides consultation on methodological design, database development, management and analyses, and support for statistical, quantitative, qualitative and ...

When researchers require some statistical expertise or data analysis know-how, The Methodology Center at Purdue (MCAP) is there. A collaboration between the Purdue University College of Health and ...

A geriatric oncology example shows how different analytic choices for longitudinal patient-reported outcomes can shift ...