Informatie over de gegevens en de codeboeken van het NKO 1989 is alleen beschikbaar in het Engels. Mocht u deze informatie willen hebben, moet u de Engelse versie van de site gebruiken (klik op de taalknop links bovenin het scherm).
Data archives (data and codebook):
Principal investigator(s): H. Anker (University of Nijmegen, the Netherlands), E.V. Oppenhuis (University of Amsterdam, the Netherlands)
Fieldwork organization: The Netherlands Central Bureau of Statistics (Centraal Bureau voor de Statistiek CBS)
Design: This study contained of two-waves. The first wave of interviews was conducted before the election in the period from July 15 until September 5 (one day before the election). This period coincided with the summer vacation period in the western part of the country, which may have had a negative effect on the response rate in this wave. The second wave of interviews started on September 9 (three days after the election) and continued through November 13. The 1989-1994 panel study was designed as a three wave panel study. The first two waves were conducted in 1989, before and after the 1989 election. The third and final wave of interviews started on May 9, 1994 (six days after the 1994 election) and continued through June 29.
Fieldwork dates: The fieldwork (main study) was done before the election, from July 15 till September 5 and after the election date from September 9 till the November 13, 1989. The election date was September 6, 1989. The fieldwork of the panel study was done from May 9, 1994 till June 29, 1989. Sampling frame: For this study a sample of 4.000 households was drawn from the Geographic Base Register – which is based to a large extent on the national mail delivery register of the Netherlands. It is an address register maintained by CBS. From all eligible citizens within each household, one person was randomly selected by interviewing the person whose birthday was first. The minimum number of addresses to be sampled for each municipality had been set at sixteen. Because sometimes more than one household belongs to the same address (each household to a maximum of three was included in the sample), the number of households in the sample had been 4.054. Because of not inhabited addresses and foreigners, the gross sample turned into 3.808. The original sample for the 1989-1994 panel study is identical to the sample drawn for the ‘regular’ 1989 Dutch Parliamentary Election Study.
Response: The response in the first wave was 46.1 percent, 1.754 respondents of the gross sample of 3.808 completed the interview. 1.506 respondents completed the interview in the second wave, which means that there was a response rate of 86 percent of the first wave. For the third wave of interviews (in the panel study) the response was 58.1 percent, so 875 respondents of the respondents in wave 2 (1.506) completed the interview.
Panel study: This election study did include a panel study. This study consisted of three waves. The first wave was held before the 1989 election, the second after the 1989 election and the third wave was held after the 1994 election. The study period of this panel study began in 1989 and ended in 1994. The principal investigators of this study were H. Anker (University of Nijmegen, the Netherlands) and E.V. Oppenhuis (University of Amsterdam, the Netherlands).