Since non-probability sampling does not require a complete survey. Non-probability sampling may be used for many different reasons. Types Of Sampling Methods In Research Briefly Explained Social Science Research Psychology Research Quantitative Research Non-probability sampling Unequal chance of being included in the sample non-random Non random or non - probability sampling refers to the sampling process in which. . In market research there are two general approaches to sampling. Non-probability sampling is a method of selecting units from a population using a subjective ie. Non-Probability Sampling Methods. While probability sampling is based on the principle of. Non-probability sampling is a sampling method that uses non-random criteria like the availability geographical proximity or expert knowledge of. Probability samples allow you to draw conclusions about the extent to which the parameters you measured differ from t...