Data archives (data and codebooks):
Principal investigator(s): C. van der Eijk (University of Amsterdam, the Netherlands), B. Niemoeller (University of Amsterdam, the Netherlands), A.Th.J. Eggen (University of Amsterdam, the Netherlands)
Fieldwork organization: Intomart b.v.
Design: This study contained a three-wave, short term panel study. 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. The panel study consisted of five waves. The first three waves were conducted in 1981, the fourth wave was held in the fall (September-October) of 1982 and the final wave was held in May till June 1986.
Fieldwork dates: The fieldwork (main study) was done before the election date from January till February 1981, from April 1977 till May 1981 and after the election date from May till June 1981. The election date was May 26, 1981. The fieldwork of the panel study was done from January 1981 till June 1986.
Sampling frame: This study consisted of a multi-stage sampling procedure. On basis of the PTT post-delivery register, first municipalities were selected both self-selective and non-self-selective. Next there was a selection of households-addresses. For this there was a minimum of four per municipality. The gross sample size had been set at 3500. Finally one respondent per household was selected. 3498 addresses were selected, the amount of households contained in these addresses was 3623. Because of not inhabited addresses and foreigners, the gross sample turned into 3326. The panel study was based on the sample drawn for the election study in 1981. For the second, third and fourth wave it was decided that persons were approached for an interview only if they had been interviewed successfully in a previous wave. The procedure for the final wave was slightly different, namely that all respondents who had participated in the first three waves were approached, irrespective of the fourth wave. As a consequence, some of the respondents in the final wave have incomplete records across all waves.
Response: 2.305 respondents completed the interview in the first wave, which means that there was a response rate of 69 percent. The response in the second wave was 79 percent of the first wave (1.812 respondents) and the response in the third wave 70 percent of the first wave (1.620 respondents). 757 interviews were completed in the fifth wave of the panel study (of which 102 were not interviewed in wave four). This led to a response of 33 percent.
Panel study: This election study did include a panel study. This study consisted, as already mentioned, of five waves. The study period of this panel study began in 1981 and ended in 1986. The principal investigators of this study were C. van der Eijk and B. Niemoeller (both University of Amsterdam, the Netherlands) and C. Irwin (University of Leiden, the Netherlands).