Not all campaign panels are created equal: Exploring how the number and timing of panel waves affect findings concerning the time of voting decision

This paper addresses the impact of the number and timing of panel waves in campaign panel surveys on findings concerning the prevalence of early, campaign, and late deciding as well as on the determinants of the time of voting decision. Using data from a seven-wave online campaign panel survey conducted during the 2009 German federal election, we demonstrate that the number and timing of panel waves affect results concerning the time of voting decision considerably. Whereas the number and timing of panel waves strongly affect the marginal distribution of decider types they do not impinge heavily upon the determinants of the time of voting decision.