Inventive Megaregions of the United States: Technological Composition and Location
研究了美国大都市区专利子类别的空间分布，通过区位商和主成分分析识别出九大技术组件，并发现它们解释了近68%的分布差异，进而定义了创新大都市区。
abstract Urban distinctiveness occurs in both technological and geographic space. This article explores spatial associations in the locational distribution of subcategories of patents across U.S. metropolitan areas. I converted patent counts to location quotients and used nonspatial methods to compare concentration levels of patents (Gini coefficients) and to identify groups of patents that tend to colocate (principal components analysis). The results show considerable variation in concentration levels and that nine groupings, entitled “technology components,” account for almost 68 percent of the variance in the distribution of the subcategories. Spatial analysis permits the exploration of spatial dependencies in each “technology component.” The results identify distinctive inventive regions that are termed inventive megaregions.