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Chapter 4 |
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Sampling
http://www.socialresearchmethods.net/kb/sampling.htm
This is the sampling section of William Trochim's Research Methods Knowledge Base. Four issues are discussed: key terms in sampling, key statistical terminology, probability sampling, and non-probability sampling. Each of these sections provides a short introduction to the topic that should help beginning students understand it more completely. Information on the most current version of this web site or a printed copy of the text can be found at http://www.atomicdog.com/trochim. Information is also available on the use of this version of the site at http://www.socialresearchmethods.net/kb/.
Sampling
http://www2.uiah.fi/projects/metodi/152.htm
This web site presents a short tutorial on sampling that offers information on random and non-random sampling, sample size, and examples of faulty sampling.
External Validity
http://www.socialresearchmethods.net/kb/external.htm
This is the external validity section of William Trochim's Research Knowledge Base. This topic defines external validity, discusses threats to it, and offers examples of how to control for these threats. Information on the most current version of this web site or a printed copy of the text can be found at http://www.atomicdog.com/trochim. Information is also available on the use of this version of the site at http://www.socialresearchmethods.net/kb/.
Probability Sampling
http://www.health.state.pa.us/HPA/Stats/techassist/probability.htm
This is a site was developed by the Pennsylvania Department of Health to offer an example of probability sampling. A short example is presented drawing a random sample using a table of random numbers.
Research Randomizer
http://www.randomizer.org/
A web site designed to assist researchers and students who want an easy way to perform random sampling or assign subjects to treatment groups.
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