Long Term Change Pattern Analysis of Bidding Price Based on Non-Parametric Framework

摘要

Resurfacing is one of the most common highway projects in Georgia with large investment every year. The unit bidding price, proposed by contractors to fulfill the project, is one of a leading indicators to reflect the cost of department of transportation (DOT) in resurfacing projects. Compared to other cost index researches, the changing trend and big volatility of unit bidding price make the analysis more difficult, and thus the Pearson and Spearman correlation test turned out to be inapplicable here to find the relation of unit bidding price to other indicators. To fill this gap while focusing on the long term trend change, the research proposed a non-parametric analysis framework, which could first find the changing trend of unit bidding price in different segments and then find the relation of trend pattern among unit bidding price and other selected indicators. The results show that the national highway construction cost index (NHCCI) could be a useful indicator to reflect the trend change of unit bidding price.