ABSTRACT
Abstract. Introduction. Unequal probability sampling. PPS sampling strategies.
In practice samples are mostly chosen, surveyed, and put to analytical studies by researchers, health organizations, economists, social scientists, demographers, biologists, physiologists, criminologists, epidemiologists, geologists, and others who are involved in social, animal, and human problems but are themselves not experts in sophisticated Sampling technologies. Market researchers and advertising agencies also fall in this category. Many such users of sample survey data draw only simple random samples even without caring for the distinction between sampling with or without replacement. But the statistician per se and especially the survey sampling experts often choose samples with varying probabilities on most occasions. They do this to derive profits. We shall narrate briefly how they achieve their gains.
