![Dr Ellie Murray, ScD on X: "In a DAG, the case-control situation seems clear to me👇🏼... selection is a consequence of the outcome and the match factor and is therefore a collider. Dr Ellie Murray, ScD on X: "In a DAG, the case-control situation seems clear to me👇🏼... selection is a consequence of the outcome and the match factor and is therefore a collider.](https://pbs.twimg.com/media/EBFn8SvWkAA-iBD.jpg)
Dr Ellie Murray, ScD on X: "In a DAG, the case-control situation seems clear to me👇🏼... selection is a consequence of the outcome and the match factor and is therefore a collider.
![Application of the matched nested case-control design to the secondary analysis of trial data | BMC Medical Research Methodology | Full Text Application of the matched nested case-control design to the secondary analysis of trial data | BMC Medical Research Methodology | Full Text](https://media.springernature.com/m685/springer-static/image/art%3A10.1186%2Fs12874-020-01007-w/MediaObjects/12874_2020_1007_Fig4_HTML.png)
Application of the matched nested case-control design to the secondary analysis of trial data | BMC Medical Research Methodology | Full Text
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