Biostatistics Quiz
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A researcher studying medication adherence finds that 15% of patients fail to complete follow-up questionnaires. Analysis reveals that missingness is associated with patient age and baseline health status (both fully observed), but shows no association with the actual adherence rates when controlling for these factors. However, the researcher suspects that patients with poor adherence may be less likely to respond regardless of their age or health status. To definitively classify this missing data mechanism, the researcher would need to:
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