Data Sampling
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Simple Random Sampling
--There is an equal probability of selecting any particular item. Sampling without replacement As each item is selected, it is removed from the population.
Sampling with replacement
--Objects are not removed from the population as they are selected for the sample. In sampling with replacement, the same object can be picked up more than once.
Stratified sampling
--Split the data into several partitions; then draw random samples from each partition
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