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    Finding the type of test : Continuous variable, difference between two study waves

    Hello everyone, I am working on a population-based study including two waves (baseline and follow-up). My variable of interest is computed using the two waves, and is the difference in renal function between follow-up and baseline (Delta = follow-up - baseline). Renal function normally...
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    Testing linearity assumption in a multiple regression model

    Hello, I would like to know how can one test the linearity assumption in a multiple regression model? I know that for a simple regression, this assumption is tested visually by examining the scatter plot between X = predictor Y = outcome, with the dots forming an ellipse and being aligned on...