Catalogue of bias: attrition bias

Attrition Bias

Assessing Attrition Bias – Addendum

A. INTRODUCTION This document serves as an addendum to the existing attrition white paper (“Assessing Attrition Bias” version 2.1) previously used for the WWC Procedures and Standards Handbook, version 2.1. This document does not recommend any substantive changes to the version 2.1 attrition bounds. Instead, this addendum presents additional empirical information and sensitivity analyses to sup...

The Effect of Cognitive Bias Modification in the Attention Bias of Students With Test Anxiety

Abstract Introduction: Many of the students chr('39')educational problems, including academic failure and maladaptive behaviors, stem from exam anxiety caused by studentschr('39') cognitive bias. Cognitive bias modification can reduce attention biases students to be negative. Therefore, the purpose of the present study was to investigate the effectiveness of cognitive bias modification interven...

A Comparison of the Effectiveness of Cognitive Bias Modification in Real and Placebo Conditions on Attentional Bias and Approach Bias in Opium Abusers

Background & Aim: Inability to control drug use is considered a core aspect of drug dependency. Part of this inability is due to cognitive biases resulting from individuals’ constant usage of drugs. The aim of the present study was to compare the effectiveness of cognitive bias modification in real and placebo conditions on attentional bias and approach bias in opium abusers. Methods: This stud...

Commentary: Empirical evidence of attrition bias in clinical trials.

postoperative deficits, there remained 79 patients available for follow-up and at risk of subsequent persistent stroke and death. This is how, in 1970, Fields and colleagues analysed the data from the Joint Study of Extracranial Arterial Occlusion, which had randomly allocated patients with bilateral carotid stenosis to carotid endarterectomy or medical treatment. 1 Among the patients who had s...