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A comment on Hydroxychloroquine Probably Isn’t the Answer. Parent comment

Re:Hydroxychloroquine Probably Isn’t the Answer by hexl on Sunday April 05, 2020 @05:39PM (#22788958)
But you already have a control which is a statistic called "survival rate after x years". If you beat it with a large enough treatment group, then you can prove it works.
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Re:Hydroxychloroquine Probably Isn’t the Answer by stewbrew on Monday April 06, 2020 @12:53AM (#22790994)
Selection bias?

If you don't control who gets the treatment, who gets a placebo, and who gets the current state of the art treatment, you cannot really exclude your results are biased. There are some ideas about how to reason with observational data but your conclusion are still weaker as with experimental data.

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