METHODOLOGY

VIP panel composition
Every month we examine the opinions of Dutch people on all kinds of current topics through online panel research. For this we have put together a special VIP panel. This panel consists of about 16,000 Dutch people and the results are representative of the Dutch population (18+) on the variables gender, education, age, region (Nielsen region), migration background and voting behavior in the House of Representatives elections.

The VIP panel is composed on the basis of a stratified random sampling from the opt-in non-probability Kieskompas panel, taking into account five characteristics: gender, age category, region (Nielsen region), education level, and migration -background. For this we use the Golden Standard of the Central Bureau of Statistics (CBS). Where necessary, the VIP panel is expanded by snowball sampling.
In general, between 35% and 50% of the panel takes part in our online opinion poll.

Regional panels
Kieskompas has a separate panel in a number of regions. That is the case in Gelderland, for example. These panels are also composed on the basis of a stratified random sample from the opt-in non-probability Kieskompas panel, taking into account four characteristics: gender, age category, education level, and migration background. For this we use the Golden Standard of the Central Bureau of Statistics (CBS). Where necessary, the panels are expanded by applying snowball sampling.

Weighting of data
In order to make the results generalizable for all voting residents of the Netherlands, Kieskompas weighs the research results. It uses an iterative post-stratification method based on different population characteristics.
The standard applied weighting method is explained below. Specific research may be slightly modified to better suit the research design.
Weighing is done with two joint distributions. The first comes from the Golden Standard of the Central Bureau of Statistics (CBS):

- Age (4 categories),
- Gender (2 categories),
- Education (2 or 3 categories)
- Nielsen region (5 or 6 categories) or region (12 categories)
- Migration background (2 or 3 categories)

The second distribution concerns the regional election results of the House of Representatives elections 2017 (source: electionsuitslagen.nl of the Electoral Council). Each sitting party is weighted separately per region, just like all other parties together, blank voters and non-voters. Young people over the age of 18 but were not yet allowed to vote in the previous parliamentary elections are weighed separately.

Weights above the 99.5th percentile have been trimmed.

This information is always accurate for the last survey conducted, but may differ slightly from previous surveys.

MORE INFORMATION

Looking for more information about our research? Click on the links below:

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