DavidB4-bot
→top: HTTP --> HTTPS #3, replaced: http://www.cdc.gov → https://www.cdc.gov
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Spelling, grammar, and general fixes
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AK
internal link
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DavidE
copy edit; internal link
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+cat
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what a causal assciation isn't
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NathanG
...
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bold
Aschlafly
undeadend
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Brian
Added source information for text
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New page: Causal association is the presence or absence of a variable (e.g. smoking) is responsible for an increase or decrease in another variable (e.g. cancer). A change in exposure leads to a cha...
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