GESIS

30/04/2018

The Open Probability-based Panel Alliance (OPPA) consists of four probability-based panels: the GESIS Panel in Germany, the LISS Panel in the Netherlands, the Korean Academic Multimode Open Survey (KAMOS) in South Korea, and the Understanding America Study (UAS) in the USA. The Alliance facilitates cross-cultural survey research with probabilitybased panels across the globe, endorsing joint