https://phys.org/news/2018-06-happiness-index.html > "At the moment, happiness indexes are based on questionnaires that a certain sample of the population answer. They are therefore very subjective values. Unlike these, our index is created based on objective data, official statistics that represent a country's entire population," explains Joan C. Micó, researcher at the Multidisciplinary Mathematics Institute of the UPV. > Among its novelties, the index also stands out for including new quantitative variables such as the quality of education, migration and the exporting and importing of goods and services.