3 ms·
For low-prevalence events the number of events that happened is just as important for statistical power as the big 32,000. Especially when doing relative risk,
by epistasis 5y ago
For low-prevalence events the number of events that happened is just as important for statistical power as the big 32,000.
Especially when doing relative risk, the confidence interval on that "27 times" could be extremely large.
- peteradio 5y agoTrue, but we aren't comparing a 1 to 0 or 1 to 2. Its 238 to 19. sqrt(238)=+/-15 sqrt(19)=+/-4 (if the numbers are to be believed) . 238/19=12.5 (238-15)/(19+4)=9.7 so it becomes 20% less on the lower end of the fluctuation which is only nominal.