Selection in a field experiment with voluntary participation (replication data)

The external validity of experiments in economics can be ensured only if participants reflect the relevant market population. We study data from a promotional campaign of NH-Hoteles to study sample selection problems in a gift exchange field experiment. The promotion allowed guests to pay any non-negative amount for a stay in one of 36 hotels in Belgium and the Netherlands. We distinguish between involuntary participants, who booked prior to the announcement of the promotional campaign, and voluntary participants, who booked after the campaign was announced. The involuntary participants pay, o... Mehr ...