lintinmypocket t1_j5xb6ic wrote
How do they know the statistics for people who didn’t get Covid because they got the vaccine?
RocknrollClown09 t1_j5xnlaw wrote
They compare similar populations, mathematically control the variables, and see if there's a difference. It's all explained in detail in the study. It's also excruciatingly reviewed by other scientists for errors in a peer review before it's published and can be referenced in other studies/experiments
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