Stratified Random Sampling

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A method of sampling that involves the division of a population into smaller groups known as strata. In stratified random sampling, the strata are formed based on members' shared attributes or characteristics. A random sample from each stratum is taken in a number proportional to the stratum's size when compared to the population. These subsets of the strata are then pooled to form a random sample.
[Source: http://www.investopedia.com/terms/stratified_random_sampling.asp]

Sayed Farrukh Ahmed
Assistant Professor
Faculty of Business & Economics
Daffodil International University