These results are consistent with the conclusion that non-probability samples yield data that are neither as accurate as nor more accurate than data obtained from probability samples.

1. Distinguish between probability and non-probability sampling and discuss the advantages and disadvantages of each. If you can not specify the probability that any given individual will be in the ...

This study reports the findings of a comparison between different non-probability sampling methods applied in a WWW-user-survey.

Serious polling requires careful data collection and careful adjustment. It doesn't mean much to say your poll is a "probability sample" when your nonresponse rate is 90 percent.

NatCen has also developed a new approach, a random-probability survey that combines web and CATI. Swales explained the aim is to provide a high-quality alternative to non-probability surveys when ...

If this proves to be a successful endeavor for the Times and CBS News, does that mean other pollsters will embrace non-probability sampling? Not necessarily. It’s important to keep in mind that online ...

A widely used modification of probability sampling techniques involves the use of quotas at the last level of a multistage area probability sample. Here we analyze an experiment comparing this ...

This paper describes certain quota sampling procedures and attempts to show that they are very close to traditional probability sampling. Quotas are shown to depend on availability for interviewing ...