New Quality Productivity —— trade and investment

The quantitative data used for this foreign trade investment index mainly comes from the statistical yearbooks and announcements of each city and province, as well as the institutional innovation index of Zhongshan Free Trade Zone University. The final result of indexing is the sum weighted result obtained after data preprocessing. The main methods include data cleaning, integration, selection, transformation, and reduction. The methods used in this article include missing value supplementation method, normalization method, etc.