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==Definition of collider==
*A variable that is influenced by two other variables
{{#mermaid:
flowchart TD
a[variable A] b[variable B] c[Collider] a & b-->c
}}
{{#mermaid:
flowchart TBTD a[Exposure] b[Outcome] c[Collider] a-->b[Outcome] a & ---->c b--->c[Collider]
}}
===Difference between collider and confounder===
*Collider is influenced by ==Collider bias in test-negative case-control design==
==Example in COVID vaccine==
