University of Gothenburg
以下でアクセス： 16 2月, 2018
In the QoG Standard CS dataset, data from and around 2014 is included. Data from 2014 is prioritized, however, if no data is available for a country for 2014, data for 2015 is included. If no data exists for 2015, data for 2013 is included, and so on up to a maximum of +/- 3 years.
In the QoG Standard TS dataset, data from 1946 to 2017 is included and the unit of analysis is country-year (e.g. Sweden-1946, Sweden-1947 and so on).