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.

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 ...

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 ...