scholarly journals ASSESSMENT OF FACTORS AFFECTING ACCURACY OF COST ESTIMATION IN PUBLIC BUILDING CONSTRUCTION PROJECTS IN WESTERN OROMIA REGION, ETHIOPIA

2020 ◽  
Vol 11 (2) ◽  
pp. 111-124
Author(s):  
Jifara Chimdi ◽  
Sisay Girma ◽  
Alemu Mosisa ◽  
Degefe Mitiku
Keyword(s):  
Cost Estimation ◽  
Construction Projects ◽  
Rank Correlation ◽  
Correlation Coefficients ◽  
Building Construction ◽  
Public Building ◽  
Factors Affecting ◽  
Public Projects ◽  
Spearman’S Rank Correlation ◽  
Importance Index

Construction projects are getting progressively complex and their scales are getting sophisticated. Along these lines, it is getting more problematic to finish the projects inside planned cost limits. In Oromia public building construction projects these problems were raised as a typical challenge. Hence, evaluation of factors affecting the accuracy of cost estimation in public projects was the aim of this study. Both quantitative and qualitative methods were utilized for information assortment. Relative Importance Index (RII) was utilized for information investigation. Totally sixty -two variables were investigated and the best five most significant were selected by this assessment based on the average view of respondents. These significant factors are; Material price/accessibility /source /quality /imports, Experience and ability of the consultant, Variability in the Economy of the country, and financial conditions of client.  Spearman's rank correlation coefficients (rho) investigation was conducted by the assistance of SPSS 20 version for a testing level of connections among respondents on the positioning of the factors affecting the accuracy of cost estimation. Spearman’s rank correlation results were 0.823 among Clients and Consultants, 0.813 among clients and contractors, and 0.802 among Consultants and Contractors. The outcome shows that the rate of the rank correlations was a high positive number, which implies there is a positive connection between them on the ranking of factors disturbing the accurateness of cost estimation in public building construction projects in western Oromia.

scholarly journals Assessment of Human Productivity Drivers for Construction Labor through Importance Rating and Risk Mapping

2020 ◽  
Vol 12 (20) ◽  
pp. 8614
Author(s):  
Murat Gunduz ◽  
Abdulrahman Abu-Hijleh
Keyword(s):  
Labor Productivity ◽  
Construction Projects ◽  
Rank Correlation ◽  
Weather Conditions ◽  
Risk Mapping ◽  
Importance Rating ◽  
Factors Affecting ◽  
Importance Index ◽  
The Impact ◽  
Productivity Factors

Labor constitutes a significant portion of the overall cost of a construction project, where labor productivity is often the main driver of the cost. Although studies on labor productivity factors exist, their frequency of occurrence in terms of their ranking remains unexplored. This study differs from other studies in the literature by introducing the frequency component to the productivity factors, a more realistic ranking of the factors by adjusting the importance by frequency (frequency adjusted importance index) and risk mapping of the factors. Moreover, this study is the first to apply risk mapping on labor productivity drivers. The aim of this paper is to identify the project factors affecting the labor productivity in construction projects and to rank these factors considering the perception of the industry on project performance. A literature review of past relevant studies was performed to identify and draft a list of factors affecting labor productivity in construction projects. Thirty-seven labor productivity factors were presented in a questionnaire to investigate the impact and frequency of their occurrence in construction projects. A 9-point scale structured questionnaire was constructed to measure the importance and the frequency of the factors and to evaluate the ranking for different categories. The frequency adjusted importance index (FAII), Spearman’s rank correlation, and risk mapping were used to study and analyze the 105 completed responses. The participants rated the following factors as the five most significant labor productivity-influencing factors: (1) poor labor supervision, (2) delays in payments, (3) poor work environment, (4) lowly skilled labor, and (5) bad weather conditions.

CAUSES AND IMPACT OF DELAY IN CONSTRUCTION INDUSTRY OF INDIA

2021 ◽  
Vol 8 (1) ◽  
pp. 35-44
Author(s):  
Kranti kumar Myneni
Keyword(s):  
Construction Industry ◽  
Correlation Coefficient ◽  
Construction Projects ◽  
Construction Project ◽  
Rank Correlation ◽  
Construction Stage ◽  
Spearman’S Rank Correlation ◽  
Spearman’S Rank Correlation Coefficient ◽  
Importance Index ◽  
Causes Of Delays

Delays can be well-defined as the escalation of the stipulated time for the completion of the project. Delay is always the major loss to any construction project. In construction projects delay is a very usual thing and it can have an adverse effect on the project’s time and cost. As construction is one of the largest economic activity in India, the effects of delay are still in millions, which surely decreases the GDP of the country. Delay makes the process tardy and management of delay is extremely challenging as most of the projects do not meet the expected requirement and fails to perform within time. Therefore, various types and causes of delays should be studied accurately. There are many researches on construction delays but they talk about the wide-ranging reasons of delay, so there stays a high requirement of a notable and feasible study on delays at different stages of construction process in India. The aim of the paper is to identify the causes of delays at different stages of construction through questionnaire survey in Indian construction industry. Analytical tools used in this research are relative importance index (RII) and spearman’s rank correlation coefficient to rank the sources of delay with respect to its occurrence in the various stages of the construction project. The study concludes based on the correlation coefficient analysis between the construction stages, that the delays associated with before-construction stage is least related, with after-construction stage is third highly related, with construction stage is second highly related and delays associated with average/overall construction is highly related.

scholarly journals Analysis of project success factors in construction industry

2015 ◽  
Vol 24 (1) ◽  
pp. 67-80 ◽  
Author(s):  
Murat GUNDUZ ◽  
Ahmad Mohammed Ali YAHYA
Keyword(s):  
Construction Industry ◽  
Construction Projects ◽  
Success Factors ◽  
Project Success ◽  
Rank Correlation ◽  
Correlation Factor ◽  
Actual Performance ◽  
Critical Success ◽  
Spearman’S Rank Correlation ◽  
Importance Index

A great emphasis has taken place to identify and analyse the factors that have been af­fecting the success and the failure of construction projects in recent decades. As a project-based industry, construction has heavily invested in such research. Moreover, the construction industry suffers the most to meet deadlines and budgets limits. The objective of this paper is to identify the critical success factors in construction industry. The study focused on Middle East region. In order to achieve this objective, 25 project success factors were identified by reviewing related literature. The factors were assessed for their impact and contribution to the actual performance of the project on three criteria: schedule, cost, and quality. Then a questionnaire was developed and sent to dif­ferent experts in the construction industry. The collected data of 111 responses was then analysed statistically by using different tools such as: importance index, Spearman’s rank correlation factor and T-test. As a result, company’s technical capacity and scope and work definition were ranked the most important factors. The results of this research may provide a great assistance to professionals and researchers in identifying the critical factors in the construction industry.

scholarly journals ASSESSING THE RISK PERCEPTION OF COST OVERRUN THROUGH IMPORTANCE RATING

2018 ◽  
Vol 24 (5) ◽  
pp. 1829-1844 ◽  
Author(s):  
Murat Gunduz ◽  
Omar Liqaa Maki
Keyword(s):  
Cost Estimation ◽  
Construction Projects ◽  
Rank Correlation ◽  
Importance Rating ◽  
Cost Overrun ◽  
Cost Index ◽  
Planning And Scheduling ◽  
Labor Skill ◽  
Spearman’S Rank Correlation ◽  
Contract Duration

Cost overrun in construction projects is a common issue affecting project performance. After a review of the literature, a list of 39 cost overrun attributes were gathered and presented in a survey. The survey was distributed online to construction professionals. 101 complete responses were received and analyzed by importance index, frequency index, cost index, frequency adjusted cost index, Spearman’s rank correlation, student’s t-test, risk assessment and factor analysis. The results of the survey revealed that the main causes of cost overrun in construction industry include inaccurate cost estimation, improper planning and scheduling, unrealistic contract duration and requirements, frequent changes to the scope of work, frequent design changes, inadequate labor/skill availability, inflation on costs of machinery, labor, material and transportation.

scholarly journals Factors Affecting Supervision Practice of Public Building Construction Projects in Dire Dawa Administration

2021 ◽  
Author(s):  
Emer Tucay Quezon
Keyword(s):  
Construction Projects ◽  
Time Budget ◽  
Construction Materials ◽  
Weather Conditions ◽  
Building Construction ◽  
Public Building ◽  
Factors Affecting ◽  
Quantitative And Qualitative Research ◽  
Supervision Practice ◽  
Construction Supervision

Proper completion of a public building construction project is dependent on the effectiveness of the construction supervision. However, it has become increasingly difficult to finish construction projects within the specified time, budget, and quality standards due to poor supervision practices. Approaches such as quantitative and qualitative research and descriptive research types were used in this study. Questionnaires survey were issued to 104 respondents, with 11 representing clients, 22 representing consultants, and 71 representing contractors. There were 33 factors identified, which were then divided into seven groups for further analysis. It was discovered that the top-ranked factors that influence construction supervision practice are: supervisors' lack of skills and experience, incompleteness and consistency in the design, lack of appropriate decision making, location of the project, material and equipment costs, a lack of construction materials supply, and effect of weather conditions. The Relative Importance Index was calculated to determine whether or not the parties agreed on the factors and ranked them according to their importance. Most respondents suggested that supervisors should receive proper training, and comprehensive and detailed drawings should be provided on time. In addition, it was discovered that the top three essential group elements affecting supervision practice of the public building project are supervisory, design, and management-related aspects.

scholarly journals Improving Performance in Construction Projects: A Case Study of Malaysian Public Projects

2021 ◽  
Vol 29 (4) ◽  
Author(s):  
Aminah Md Yusof ◽  
Ali Raza Khoso ◽  
Samiullah Sohu ◽  
Shabir Hussain Khahro ◽  
Chang Saar Chai
Keyword(s):  
Construction Projects ◽  
Poor Performance ◽  
Influential Factors ◽  
Mitigation Measures ◽  
Group Discussions ◽  
Factors Affecting ◽  
Public Projects ◽  
The Poor ◽  
Importance Index ◽  
Project Life

Studies have worked out measures to curb the poor performance problems. However, it is hard to investigate the actual reasons because of the diverse construction culture of different countries. This research aims to develop a framework for mitigating the problems triggering the poor performance via a novel classification. An empirical analysis of mean and relative importance index (RII) was performed in SPSS of collected data from 56 public projects in Malaysia from 2003 to 2014. Qualitative and quantitative data was analysed from Audit General’s Reports, interviews, a pilot survey, and a full-scale experts’ survey. Findings from research investigated that the most influential factors affecting poor performance are not genuinely linked with those investigated from Audit General’s Report except a few. Furthermore, the study findings conclude that related financial problems and construction stage from project life cycle contribute to poor performance. The potential mitigation measures are worked out and validated via focused group discussions with experts. Finally, a framework was developed that emphasised Competent, Commitment, Communication, Comfort and Collaboration (5Cs) to mitigate the poor performance issues. The study is limited to identifying factors contributing to poor performance; however, relevant responsible stakeholders should also need to be identified in the future.

scholarly journals Factors Affecting the Performance in the Implementation of Government Building Construction Projects: A Case Study in Bole Sub- City of Addis Ababa

2020 ◽  
Author(s):  
Serkalem Molla ◽  
Emer Quezon ◽  
Eyob Mekonnen ◽  
Woyesa Ararsa ◽  
Dumesa Gudissa ◽  
...  
Keyword(s):  
Construction Projects ◽  
Raw Materials ◽  
Addis Ababa ◽  
Commodity Prices ◽  
Building Projects ◽  
Public Building ◽  
Factors Affecting ◽  
Importance Index ◽  
The Government ◽  
Building Project

Building project implementation has so many issues and complex performance, such as time, cost, quality, and safety. This study identified and assessed the essential factors influencing the implementation of public building projects, particularly in the Bole Sub-city of Addis Ababa. There were 46 factors identified, validated, and divided into 9 categories. Questionnaires are distributed to 120 respondents, of which 8 for owners, 25 for consultants, 86 for contractors, and one head of the office. The key factors decided upon were: liquidity of the organization, improved availability of commodity prices for people with high experience and expertise, and the quality of equipment and raw materials in the project. The agreement between the parties on the ranking of factors was calculated based on their Relative Importance Index. Besides, the value of the Cronbach’s Alpha for variables calculated above 0.7, which means the data and scale are reliable and accepted for further analysis to correlate the different groups of factors. Results showed that cost, time, quality, productivity, and customer satisfaction are the top five essential factors affecting the performance of the government public building in the study area.

scholarly journals Concurrent validity of the Sensory Organization Test measures in unilateral transtibial amputees

2012 ◽  
Vol 37 (1) ◽  
pp. 65-69 ◽  
Author(s):  
Prasath Jayakaran ◽  
Gillian M Johnson ◽  
S John Sullivan
Keyword(s):  
Concurrent Validity ◽  
Rank Correlation ◽  
Correlation Coefficients ◽  
Sensory Organization Test ◽  
Spearman’S Rank Correlation ◽  
Sensory Organization ◽  
Clinical Measures ◽  
Transtibial Amputees ◽  
Lower Limb Amputees ◽  
Strategy Score

Background and Aim: The physical asymmetries associated with a prosthesis raises the question of validity of the Sensory Organization Test (SOT) measures (equilibrium score (ES) and strategy score (SS)) in lower limb amputees. This study explores the validity of these measures in transtibial amputees by correlating with their corresponding centre of pressure (COP) excursion/velocity measures. Technique: Fifteen transtibial amputees (69.5 ± 6.5 years) completed three trials for each of the six SOT conditions. Discussion: The Spearman’s rank correlation coefficients between ESs and global COP excursion/velocity measures ranged from 0.52 to 0.71 for Conditions 1, 4 and 5, 0.79 to 0.85 for Conditions 2 and 3, and 0.39 to 0.43 for Condition 6. The coefficients for SSs ranged between 0.78 and 0.97 for Conditions 1 to 5 and 0.55 to 0.67 for Condition 6. The corresponding sound and prosthetic side COP variables demonstrated varying strengths of association with ES and SS. Clinical relevance Of the two clinical measures examined, the SSs are strongly reflective of COP excursion/velocity measures and these findings have application in the interpretation of SOT when evaluating balance in transtibial amputees.

scholarly journals Toward Capturing the Exposome: Exposure Biomarker Variability and Co-Exposure Patterns in the Shared Environment

2017 ◽  
Author(s):  
Ming Kei Chung ◽  
Kurunthachalam Kannan ◽  
Germaine M. Buck Louis ◽  
Chirag J. Patel
Keyword(s):  
Rank Correlation ◽  
Correlation Coefficients ◽  
Shared Environment ◽  
Specific Factor ◽  
Endocrine Disrupting Chemical ◽  
Spearman’S Rank Correlation ◽  
Exposure Biomarker ◽  
Exposure Patterns ◽  
Household Environment ◽  
Study Participants

AbstractBACKGROUND:Along with time, variation in the exposome is dependent on the location and sex of study participants. One specific factor that may influence exposure co-variations is a shared household environment.OBJECTIVES:To examine the influence of shared household and partner’s sex in relation to the variation in 128 endocrine disrupting chemical (EDC) exposures among couples.METHODS:In a cohort comprising 501 couples trying for pregnancy, we measured 128 (13 chemical classes) persistent and non-persistent EDCs and estimated 1) sex-specific differences; 2) variance explained by shared household; and 3) Spearman’s rank correlation coefficients (rs) for females, males, and couples’ exposures.RESULTS:Sex was correlated with 8 EDCs including polyfluoroalkyl substances (PFASs) (p< 0.05). Shared household explained 43% and 41% of the total variance for PFASs and blood metals, respectively, but less than 20% for the remaining 11 EDC classes. Co-exposure patterns of the exposome were similar between females and males, with within-classrs higher for persistent and lower for non-persistent chemicals. Medianrss of polybrominated compounds and urine metalloids were 0.45 and 0.09, respectively, for females (0.41 and 0.08 for males), whereas lowerrss for these 2 classes were found for couples (0.21 and 0.04).CONCLUSIONS:Overall, sex did not significantly affect EDC levels in couples. Individual, rather than shared environment, could be a major factor influencing the co-variation of 128 markers of the exposome. Correlations between exposures are lower in couples than in individual partners and have important analytical and sampling implications for epidemiological study.

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