7 Threats to validity
7.1 Random error and bias
7.2 Selection bias
7.3 Information bias
7.4 Confounding
7.5 Causal diagrams
7.6 Controlling confounding
7.7 Problems
7.2 Selection bias
7.3 Information bias
7.4 Confounding
7.5 Causal diagrams
7.6 Controlling confounding
7.7 Problems
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