4 ms·
How about this? Playing soccer causes broken hips, but soccer playing is in fact anti-correlated with broken hip incidence. Why? Because most broken hips occur
by afafsd 12y ago
How about this? Playing soccer causes broken hips, but soccer playing is in fact anti-correlated with broken hip incidence. Why? Because most broken hips occur among extremely old people, who generally don't play soccer.
[I'm not sure whether this is actually statistically true, but you get the idea, and I'm sure there's a similar example which actually is true.]
- tonyl7126 12y agoJust because old people tend to break their hips more often than younger people wouldn't necessarily make soccer anti-correlated with hip injuries. In your example, if you compared two groups that are identical, the only difference being one plays soccer and the other doesn't, you'd find a correlation between soccer and broken hips.