Researchers face a difficult choice between probability sampling methods in practice - which are increasingly expensive and far from the theoretical results that justify their use - and non-probability sampling methods - which are cheaper and faster, but less familiar and more varied.
Abacwaningi babhekene nokukhetha okunzima phakathi kwezindlela zokwenza izampula ezenzakalweni-eziya ngokuya ezibizayo futhi ezikude nemiphumela yezinkolelo ezibonisa izindlela zabo zokusebenzisa-nezingahle zingenakwenzeka-ezingabizi futhi zishesha, kodwa zingaphansi futhi zijwayele kakhulu.