长江三角洲各城市综合实力的主成分分析

运用主成分分析方法，通过建立一套涵盖5个层次16个方面共34个指标的城市指标体系， 对长江三角洲15个城市的综合实力进行计算和比较。运用SPSS10．0统计软件对上述指标进行标准化处理，用方差最大法正交旋转，并通过载荷 系数分析得出六个主成分。将各主成分得分结合主成分权数进行综合计算得出各城市的综合得分，按得分由高到低依次是上海、南京、杭州、苏州、无锡、宁波、镇江、绍兴、常州、南通、扬州、泰州、舟山、嘉兴和湖州。根据各城市的综合得分水平，将长江三角洲的城市分为一个核心三个圈层，并比较分析各个城市的相对优势、薄弱环节及其差异引致因素，对其今后的发展提出若干建议。认为长江三角洲在今后的发展中，应以上海为核心，以南京、杭州、苏州为三个支点，加强区域内的分工与协作，促进区域的共同繁荣。

A PRINCIPLE COMPONENT ANALYSIS ON SYNTHETICAL STRENGTH FOR CITIES IN THE CHANGJIANG RIVER DELTA

This article calculates and compares synthetical strength of the 15 cities in the Changjiang River Delta through principle component analysis by setting up a series of indexes, including 5 stratums, 16 aspects, 34 indexes total. On the analysis, by normalizing the indexes with Statistical Software SPSS10.0, rotating them by the method of varimax, analyzing the component matrix, six components were draw. And then, by multiplying each component score and corresponding component proportion, summing the consequences, the synthetical strength of the cities was calculatecd. From high to slow, they are Shanghai, Nanjing, Hangzhou, Suzhou, Wuxi, Ningbo, Zhenjiang, Shaoxing, Changzhou, Nantong, Yangzhou, Taizhou, Zhoushan, Jiaxing and Huzhou. According to the level of the synthetical strength, the cities were classifies into one core and three circles. In the development of the future, Shanghai should be put in a central position in the Changjiang River Delta and Nanjing, Hangzhou, Suzhou in important pivot positions, and regional division to enhance common prosperity and collaboration be strengthend.