In their analysis comprised bids from eight bidders, they have not considered the less
competitive bidding trend after a winning bid detected in McCaffer and Pettitt’s cusum
curve. Although these two empirical studies have not applied modelling techniques to
provide statistics concerning significance of bidding trends before and after a winning
bid, they are considered the closest studies that provide a direction for empirical
investigation in this study. Here, we use a piecewise mixed effects modelling approach
to model the process of changes in the bid price of building work before and after a
winning bid. It aims to further test the McCaffer and Pettitt’s cusum curve,
hypothesising that “winning bids are preceded by increasingly more competitive bids,
which will then be followed by less competitive bids”.