Australian project time-cost analysis: statistical analysis of intertemporal trends

Skitmore, Martin & Ng, S. Thomas (2001) Australian project time-cost analysis: statistical analysis of intertemporal trends. Construction Management and Economics, 19(5), pp. 455-458.


In investigating intertemporal movements in time-cost relationships via the Bromilow model, it is shown that, with a recently collected sample of data from the Australian State of New South Wales, the constant term in the linearised regression equation is not significantly (p<0.05) different from zero when the contract value is measured in dollars, rather than millions of dollars. This is equivalent to a K value of unity in the original, non-linear, version of the model. This is utilised to develop a new and simpler measure of the time-cost relationship in the form of the ratio which has the advantage of being obtainable for each project. A scatter plot and statistical analysis of the project ratios indicate significant yearly fluctuations but no underlying trend. Assuming similar characteristics of the data from previous studies, equivalent average ratios are estimated and plotted, providing visual evidence of a downward trend. The statistical analysis, however, is inconclusive on the issue, there being insufficient data (six points) for a full analysis.

Impact and interest:

Search Google Scholar™

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

411 since deposited on 16 May 2006
6 in the past twelve months

Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 4149
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: Time, cost, models, trend, Bromilow, intertemporal, non, linear
ISSN: 1466-433X
Subjects: Australian and New Zealand Standard Research Classification > BUILT ENVIRONMENT AND DESIGN (120000) > BUILDING (120200) > Quantity Surveying (120203)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2001 Taylor & Francis
Copyright Statement: First published in Construction Management and Economics 19(5):pp. 455-458.
Deposited On: 16 May 2006 00:00
Last Modified: 09 Jun 2010 12:32

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page