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This gave rise to a longitudinal data model that assumes a repeated measures structure, where each participant provided a time-series of measurements both for the outcome, change in lnAPRI, for the exposure of interest, HAART intake since the last visit, and for time-varying covariates, i.e., CD4+ T-lymphocyte count, CD8+ T-lymphocyte count, and HIV RNA.
As measurements were taken from each well through time, we used a repeated measures structure, determining the most appropriate covariance structure (unstructured and allowing for different variances at each time point) using the Akaike Information Criteria (AIC) and utilising Restricted Maximum Likelihood (REML) estimation.
To account for the heterogeneous treatment effect and the repeated measures structure, random effects are incorporated into the model.
As each yield measurement was calculated relative to the mean monoculture levels of metabolic activity at the appropriate point in time, there was no requirement to use a repeated measures structure.
They define the repeated measures structure of the data [ 10].
The measures (structure, process and outcome) are related to important dimensions of quality and patient safety.
Similar(52)
So should his suggestion that we "break the GDP spell" and establish measures, structures, and regulations that support these goals.
Biochemical markers of OA progression represent a surrogate for structural change which may have advantages over existing methods of measuring structure.
We introduce the notion of covariance measure structure for square integrable stochastic processes.
Assessment, measure; structure, year, growth, velocity, stature; skeletal, metaphysis, wrist, cartilage; child, baby, birth, premature; adult, osteoporosis.
For example, the constant comparative analysis of the ECERS-R reveals that the scales measure structure quality rather than process quality (Cassidy et al., 2005).
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