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"welldefined" - 2 õppematerjali

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Austraalia referaat inglise keeles

Tallinn 2007 Table of contents: Factfile............................................................................................. ................................. Symbols.......................................................................................... ....................................Head of State................................................................................................ ................... Government....................................................................................... ............................... History............................................................................................. .................................. Relief...................................................................................................

Inglise keel - Põhikool
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18
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Vormistamine ülesanne 3

For an overview of different types of web surveys and their potential for errors, see lozar manfreda and vehovar (chapter 14). The availability of comprehensive lists or algorithms that cover the population differs widely depending on the target population, but also on the country. For instance, in countries like Denmark and The Netherlands the national statistical agency has access to the population registry (see also Bethlehem Chapter 26). This makes it possible for the national statistical agency to draw a probability sample not only of the general population, but also to draw specific subsamples. Some countries have good lists of mobile phone users, whereas others do not. In some areas, the telephone system has a welldefined structure of used and unused number banks, which makes it possible to generate random telephone numbers with good coverage properties. In most areas, the telephone system does not have such a structure or several competing telephone systems are in use, which makes generating random telephone numbers more difficult (cf. Steeh, Chapter 12). Web surveys are a special challenge to survey methodologists, because the coverage problem is large and difficult to solve. There are no lists of the population that can be used to draw samples with known properties. Email addresses have no common structure that can be used to generate random addresses similar to the way random telephone numbers are generated in RDD. Finally, the often-used volunteer samples are convenience samples, for which coverage cannot be determined (cf. Lozar Manfreda & Vehovar, Chapter 14). 1.4.2 Sampling and Sampling Error Sampling error occurs because only a sa...

Andme-ja tekstitöötlus - Tallinna Tehnikakõrgkool
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