What is the method of sampling in which the units are picked up at regular intervals from the universe?
Systematic sampling is a type of probability sampling method in which sample members from a larger population are selected according to a random staing point but with a fixed, periodic interval. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 913
Simple random sampling
Systematic random sampling
Stratified random sampling
Snow ball sampling
Epidemiology