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Annual Report - National Research Council, Division of Earth Sciences
Issues for accompanied by appendices, consisting of reports of the division's committees. In a few cases the committee report is preliminary and the complete report is issued separately. Beginning with committee reports are issued separately.
Annual Report
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Annual Report - National Research Council, Division of Earth Sciences
Issues for accompanied by appendices, consisting of reports of the division's committees. In a few cases the committee report is preliminary and the complete report is issued separately. Beginning with committee reports are issued separately.
The Division of Engineering of the National Research Council in Cooperation with Engineering Foundations
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The Prevention and Treatment of Missing Data in Clinical Trials
Randomized clinical trials are the primary tool for evaluating new medical interventions. Randomization provides for a fair comparison between treatment and control groups, balancing out, on average, distributions of known and unknown factors among the participants. Unfortunately, these studies often lack a substantial percentage of data. This missing data reduces the benefit provided by the randomization and introduces potential biases in the comparison of the treatment groups. Missing data can arise for a variety of reasons, including the inability or unwillingness of participants to meet appointments for evaluation. And in some studies, some or all of data collection ceases when participa...
