Repeated Measures
نویسنده
چکیده
Repeated measures refer to the observations taken on the same subject (plant, animal, person, etc). There is usually a variation among the subjects, which is modeled by random effects. Here is an example. A completely randomized design with a single factor (with fertilizer or without). Each treatment is applied to three plants and the root length of each plant is measured on five occasions (week 2, 4, 6, 8, 10). The following plots reveal a difference between the two treatments and also variations among the plants.
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Statistical Methods for the Analysis of Repeated Measurements
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A repeated-measures design is one in which multiple, or repeated, measurements are made on each experimental unit. The experimental unit could be a person or an animal, and repeated measurements might be taken serially in time, such as in weekly systolic blood pressures or monthly weights. The repeated assessments might be measured under different experimental conditions. Repeated measurements ...
متن کاملVariance components linkage analysis with repeated measurements.
BACKGROUND When subjects are measured multiple times, linkage analysis needs to appropriately model these repeated measures. A number of methods have been proposed to model repeated measures in linkage analysis. Here, we focus on assessing the impact of repeated measures on the power and cost of a linkage study. METHODS We describe three alternative extensions of the variance components appro...
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BACKGROUND The analysis of repeated-measures data presents challenges to investigators and is a topic for ongoing discussion in the Archives of General Psychiatry. Traditional methods of statistical analysis (end-point analysis and univariate and multivariate repeated-measures analysis of variance [rANOVA and rMANOVA, respectively]) have known disadvantages. More sophisticated mixed-effects mod...
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Repeated measures analysis is an important tool for educators committed to evaluating the performance of their students and courses. While evaluations can be performed using a series of t-tests, repeated measures provides practitioners and researchers a more sophisticated tool to analyze the impact of education over time or interventions that employ concurrent tests to measure a particular set ...
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