Sampling from a Data Stream
What is Sampling ? • The sample method involves taking a representative selection of the population and using the data collected as research information. • A sample is a “subgroup of a population”. • As a way of obtaining a group of people or objects to study that were representative of a large population or universe of interest. (Stacks & Hocking, 1999) •
Concept of Sampling ELEMENT POPULATION SAMPLE SUBJECT
Types of Sampling • Probabilty Sampling: A sampling process where every single individual elements in the population have an oppertunity to be choosen as a sample. • Nonprobabilty Sampling: • A sampling process where every single individual elements in the population may not have an opportunity to be choosen as a sample.