Source data archives (data and codebooks):
Principal investigator(s): G.A. Irwin (University of Leiden, the Netherlands); J. Verhoef (University of Leiden, the Netherlands); C.J. Wiebrens (Zuiver Wetenschappelijk Onderzoek (ZWO), the Netherlands)
Fieldwork organization: Interact b.v.
Design: This study contained a two-wave election survey. The first wave was held during the election campaign, which means from the end of March till half May. The second wave was held directly after the election date of May 25, 1977. The researchers tried to end in June with the post-election interview. Because this could not been reached, the second wave ended at the beginning of August.
Fieldwork dates: The fieldwork was done from March 1977 till August 1977. The election date was May 25, 1977. Sampling frame: The researchers wanted to reach an amount of 2000 interviews in the first wave and an amount of 1500 interviews in the second wave. A non-response rate of 25-30 percent was taken into account, which meant that they started the fieldwork with 2758 addresses. These addresses came from a register of a Mini Census. In the first wave of the fieldwork 1770 interviews were successful collected. There were also 86 interviews held with members of a great housekeeping. These 86 addresses were obtained by a separate sample.
Response: The 1856 respondents who completed the pre-election interview – which means there was a response rate of 67 percent – were asked to have a second interview. Of these 1856 respondents 1434 respondents also completed the post-election interview, this leads to response of 77 percent of the first wave. The other 422 respondents of the first wave reject to participate or could not been reached anymore.
Panel study: This election study did not include a panel study.