针对问题三，为了对19个城市进行排序，选取了8个指标建立了城市经济活力

For the three, in order of 19 cities to sort, select the eight indicators established urban economic vitality evaluation system, and factor analysis model to calculate the economic vitality of 19 cities overall score of 19 cities conducted scores rankings. First, according to data collected eight indicators of 19 cities, and then use SPSS software for data were obtained by factor analysis, the city ranked.

In order to sort 19 cities, 8 indicators were selected to establish the evaluation index system of urban economic vitality, and the comprehensive score of economic vitality of 19 cities was calculated using factor analysis model, and 19 cities were ranked in the score. First, according to 8 indicators to collect data from 19 cities, and then the use of SPSS software to obtain factor analysis of the data, the city ranking.

To solve the third problem, in order to rank 19 cities, 8 indexes are selected to establish the evaluation index system of urban economic vitality, and the comprehensive scores of 19 cities are calculated by factor analysis model, and 19 cities are ranked. Firstly, 19 cities' data are collected according to 8 indexes, and then factor analysis is carried out with SPSS software to get the city ranking.<br>