Ralative risk and odds ratio

http://blog.naver.com/biostat_yu/220593739742

Prospective vs retrospective

http://healingcomz.com/220530333331

T-value

http://blog.naver.com/ssacstat/220688153345


T-test


A, B drug


Which one is the best


Comparing A and B using Test


Null hypotheise  A drug and B drug has no difference.


Test  p - value >0.5 null is accepted.


that means A and B has no difference.


if  p-value < 0.5 null is rejected and alternative is accepted = two drug have difference.