Maintaining quality

As researchers we know how important the quality of the response is for the research. We do everything possible to guard the quality of the response (and the members), in several ways. All subscriptions go through a double opt-in process. We also keep a blacklist of members that are disqualified for future research, for whatever reason. They may have filled in earlier surveys either without taking it seriously (straight liners) or too quickly (speeders). We also check for data consistency: someone who first claims to be a woman, but later claims to be a man, is excluded. Furthermore, we make use of deduplication based on IP adresses and cookies. 

During their membership, our panel members update their profile information, which is a good indication of the member's quality. We also completely clean up the panel files every six months, and inactive members are automatically unsubscribed from the panel. All these activities ensure the best possible response quality!