The sampling method used in several stages (Multi-Stage Sampling) by selecting the do not rely on principles of probability (Non-Probability Sampling) is a specific sampling (Purposive Sampling) in order to obtain a sample that is consistent with the purpose of research, analysis, and reporting. Snow ball (Snowball Sampling) is selected, for example, the default properties as needed, and provide examples that suggest, for example, with the same characteristics.
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