Commentary on “Bias in observational studies”
This is actually the third conference on the topic of weak associations or, as we may now be calling them, small effects. E. Wynder organised one almost fifteen years ago and a second some ten years ago. The topic I had to discuss ten years ago had almost the same title as today’s talk, “Biases and Weak Associations”. So I went back to my previous publication and saw that I could say just about the same things now. But I will give that as a reference (Feinleib 1987; Wynder et al. 1982; Sackett 1979) and go on to some other points at the present time.
KeywordsInstrumental Variable Weak Association Nutritional Disorder Relevant Exposure Specific Cancer Site
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