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Sampling

Sampling is a method to understand whole part by a little number of data. For example, quick news of election. I always wonder because the news is reported so quickly after the start of the vote.

Kinds of Sampling

• Significant Sampling : Select data with experience
• Random Sampling : Select randomly
• Multistage Sampling : One of the significant selection. Use stratification

The Stage to Use Sampling

"Sampling" is often introduced in "questionnaire". And sampling, the process to prepare data, is an important pre-process of Multi-Variable Analysis and Data Mining . And it is important to define levels and factors in Design of Experiments .

The points of sampling are stratification , clustering and randomness.

NEXT Stratified Sampling