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_Homework_table7.3 - effects Selective loss of data Variety...

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Table 7.3 Some Bias Types and Their Potential Effects on the Results of Clinical Trials Types of Bias Potential Consequences Selection bias May affect external validity, especially if the study has no internal controls. Procedure selection Healthier patients selected for a particular treatment may cause it to look good. Postentry exclusion Over optimistic view of the treatment, especially side
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Unformatted text preview: effects. Selective loss of data Variety of effects depending on the mechanism of data loss. Ascertainment bias Treatment effect is brought more into alignment with prior expectation Retroactive definitions Strong anticonservative bias is possible. Uncontrolled covariate Confounding of treatment effect with covariate effect....
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