Comparative studies on the significance of difference between China state-owned and non-state-owned contractors within industry segmentation

Based on the ranking statistics of ENR China Top 60 Contractors from 2006 to 2009, this paper is concentrating on the significance of difference between state-owned and non-state-owned contractors in various industries and how this significance of difference changed from year to year, using Wilcoxon-type rank-sum test. The research shows that the state-owned contractors were superior in transportation, water supply, industrial process and other 3 industries. Moreover, the advantage in certain industries is expanding. Finally, the author gives some explanations for this phenomenon. This research makes contribution to the further study on the cause of the difference and effectiveness of China building industry policies.