Bibliographic Details
| Title: |
Accuracy and Precision of an Effect Size and Its Variance From a Multilevel Model for Cluster Randomized Trials: A Simulation Study. |
| Authors: |
Ames, Allison Jennifer1 ajames@uncg.edu |
| Source: |
Multivariate Behavioral Research. Jul/Aug2013, Vol. 48 Issue 4, p592-618. 27p. |
| Subject Terms: |
Regression analysis, Estimation theory, Mathematical models, Monte Carlo method, Simulation methods & models |
| Abstract: |
This article investigates an effect size (MLM ES) and its variance for cluster randomized trials based on parameter estimates from multilevel modeling analysis. Accuracy and precision of MLM ES were evaluated using Monte Carlo simulation methods and compared with the performance of an effect size, computed from summary statistics, proposed by Hedges (2007; Hedges'dB). Simulation results indicated that MLM ES had acceptable accuracy in all conditions, also demonstrating efficiency and consistency. With small sample sizes, MLM ES did not suffer from the same negative bias as Hedges'dBdue to overestimation of between-cluster variance. With large sample sizes, MLM ES and Hedges'dBwere comparable for accuracy and efficiency. Both MLM ES and Hedges'dBshowed considerable bias in some conditions when cluster sizes were unequal. An illustrative example using real data was provided. [ABSTRACT FROM PUBLISHER] |
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| Database: |
Education Research Complete |
