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Study in the state of world countries' happiness begins to gain global attention and recognition. Several data sources were established to show critical factors related to the happiness of individual countries. The data that this study used is from World Happiness Report, which is a leading data source in this area. This World Happiness Report was first published in 2012. This article involved all factors that the 2019 World Happiness Report used and tried to identify the most useful information by using Lasso model to achieve the dimension reduction of the beneficial factors.