Vormistamine ülesanne 3
Individuals who lack these are not
covered. In addition, interviewing software is in general not hardware or software independent.
Screens look differently in different resolutions, or when different browsers are used to access the
survey website, and some combinations of hardware and software may make the survey website
inaccessible to some users, resulting in coverage error. 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
annaabi.ee 
