Learn the distinctions between simple and stratified random sampling. Understand how researchers use these methods to accurately represent data populations.

The method of systematic random sampling (METHOD=SYS) selects units at a fixed interval throughout the sampling frame or stratum after a random start. PROC SURVEYSELECT chooses the first unit randomly ...

The method of simple random sampling (METHOD=SRS) selects units with equal probability and without replacement. Each possible sample of n different units out of N has the same probability of being ...

A study by the universities of Cordoba and Seville develops a method that makes it possible to verify, easily and quickly, whether an olive plantation is traditional, intensive, or super-intensive.

Dr Jacob John, former chief of ICMR's Centre for Advanced Research in Virology, speaks to TOI on why the outcome of random sampling may not be a correct measure of the extent of the Covid-19 threat ...