How does selection bias affect results?

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Tags

1. #sometimes
2. #achieved
3. #obtained
4. #introduced
5. #effect
6. #referred
7. #individuals
8. #population
9. #thereby
10. #representative
11. #analysis
12. #proper
13. #analyzed
14. #randomization
15. #selection
16. #ensuring
17. #sample
18. #groups
19. #intended