Sampling Terminology

Sampling Terminology

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Two Major Types of Sampling Methods Probability sampling Uses some form of random selection.

Requires that each unit have a known (often equal) probability of being selected.

Nonprobability sampling

Selection is systematic or haphazard, but not random.

Š 2007 Thomson, a part of the Thomson Corporation. Thomson, the Star logo, and Atomic Dog are trademarks used herein under license. All rights reserved.

Groups in Sampling Who do you want to generalize to?

Š 2007 Thomson, a part of the Thomson Corporation. Thomson, the Star logo, and Atomic Dog are trademarks used herein under license. All rights reserved.

Groups in Sampling The theoretical population

Š 2007 Thomson, a part of the Thomson Corporation. Thomson, the Star logo, and Atomic Dog are trademarks used herein under license. All rights reserved.

Groups in Sampling The theoretical population What population can you get access to?

Š 2007 Thomson, a part of the Thomson Corporation. Thomson, the Star logo, and Atomic Dog are trademarks used herein under license. All rights reserved.

Groups in Sampling The Theoretical Population The study population

Š 2007 Thomson, a part of the Thomson Corporation. Thomson, the Star logo, and Atomic Dog are trademarks used herein under license. All rights reserved.

Groups in Sampling The theoretical population The study population How can you get access to them?

Š 2007 Thomson, a part of the Thomson Corporation. Thomson, the Star logo, and Atomic Dog are trademarks used herein under license. All rights reserved.

Groups in Sampling The theoretical population The study population The sampling frame

Š 2007 Thomson, a part of the Thomson Corporation. Thomson, the Star logo, and Atomic Dog are trademarks used herein under license. All rights reserved.

Groups in Sampling The theoretical population The study population The sampling frame

Who is in your study? Š 2007 Thomson, a part of the Thomson Corporation. Thomson, the Star logo, and Atomic Dog are trademarks used herein under license. All rights reserved.

Groups in Sampling The theoretical population The study population The sampling frame

The sample Š 2007 Thomson, a part of the Thomson Corporation. Thomson, the Star logo, and Atomic Dog are trademarks used herein under license. All rights reserved.

Where Can We Go Wrong?

The theoretical population The study population The sampling frame

The sample Š 2007 Thomson, a part of the Thomson Corporation. Thomson, the Star logo, and Atomic Dog are trademarks used herein under license. All rights reserved.

Where Can We Go Wrong?

The theoretical population The study population The sampling frame

The sample Š 2007 Thomson, a part of the Thomson Corporation. Thomson, the Star logo, and Atomic Dog are trademarks used herein under license. All rights reserved.

Where Can We Go Wrong?

The theoretical population The study population The sampling frame

The sample Š 2007 Thomson, a part of the Thomson Corporation. Thomson, the Star logo, and Atomic Dog are trademarks used herein under license. All rights reserved.

Where Can We Go Wrong?

The theoretical population The study population The sampling frame

The sample Š 2007 Thomson, a part of the Thomson Corporation. Thomson, the Star logo, and Atomic Dog are trademarks used herein under license. All rights reserved.