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- W2050426297 abstract "Purpose: To a) introduce and present the advantages of linear mixed models using generalized least squares (GLS) when analyzing repeated measures data; and b) show how model misspecification and an inappropriate analysis using repeated measures ANOVA with ordinary least squares (OLS) methodology can negatively impact the probability of occurrence of Type I error. Methods: The effects of three strength-training groups were simulated. Strength gains had two slope conditions: null (no gain), and moderate (moderate gain). Ten subjects were hypothetically measured at five time points, and the correlation between measurements within a subject was modeled as compound symmetric (CS), autoregressive lag 1 (AR(1)), and random coefficients (RC). A thousand data sets were generated for each correlation structure. Then, each was analyzed four times—once using OLS, and three times using GLS, assuming the following variance/covariance structures: CS, AR(1), and RC. Results: OLS produced substantially inflated probabilities of Type I errors when the variance/covariance structure of the data set was not CS. The RC model was less affected by the actual variance/covariance structure of the data set, and gave good estimates across all conditions. Conclusions: Using OLS to analyze repeated measures data is inappropriate when the covariance structure is not known to be CS. Random coefficients growth curve models may be useful when the variance/covariance structure of the data set is unknown." @default.
- W2050426297 created "2016-06-24" @default.
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- W2050426297 date "2004-12-01" @default.
- W2050426297 modified "2023-09-27" @default.
- W2050426297 title "Aging Issues in Cardiology" @default.
- W2050426297 doi "https://doi.org/10.1097/00005768-200412000-00022" @default.
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