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The adoption of a clustered design has implications for design, conduct and analysis of studies.
This study used a randomized pretest posttest clustered design to examine the effect of 3 homework purposes (i.e., practice, preparation, and extension) on 6th graders' mathematics achievement and how this relationship was modulated by the amount of completed homework.
Because of the design of the TIMSS survey, with students clustered within schools, we used the Mplus complex survey design option to control the clustered design and adjust standard errors.
The analysis was adjusted for the clustered design.
PROC SURVEYREG was used to generate variance estimates appropriate for the clustered design.
Yi and Cook reported marginal methods for missing longitudinal data from clustered design [ 12].
SUDAAN calculates variance estimates that account for the complex, clustered design of NHANES.
Second, the intervention (hip protection) may work better using a clustered design.
A reliability analysis of the data on individuals was conducted, without adjusting for the clustered design.
The strengths of SMILE include: a large sample, clustered design and relatively high follow-up rates.
Data analyses were conducted using multilevel methods (generalized linear mixed models) to account for the clustered design.
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