Answer:
Retrospective
Step-by-step explanation:
This is a sampling type in which the outcome has already occurred at the time of the study. It is the collecting of data from source by looking back into past events and using the information to draw outcomes. This can be either cohort or case, the study can assist us to use past records to predict future events. Most of the events investigated are uncommon and have special characteristics. Another example is investigating women who survived breast cancer in Asia.
