## 1 Introduction  
The uncertain hazards that are present during the construction process are referred to as risk factors. To ensure the efficient completion of construction projects, project managers generally implement a risk control mechanism. A risk control mechanism encompasses risk identification, risk assessment, and risk management. Project managers apply various methods to identify the relationship between risks and project quality (risk identification), quantify the harmfulness of risk factors (risk assessment), and manage major risk factors (risk management) through measures such as reinforcing the inspection of major risk factors. Risk managements play a key role in the success of construction projects. A lack of risk identification and evaluation might result in insufficient risk management, which considerably hinders the appropriate use of project resources [1]. Poor resource balancing often results in the risk of resource conflict in project management [2]. [PERSON] et al. [3] reported that construction risks originate from different construction companies and construction sites and thus are multisource risks. [PERSON] [4] divided construction project risks according to their sources into internal and external risks. Internal risks refer to major variables in a construction project related to the local market or local construction industry. External risksrefer to uncertain variables in a construction project related to the company undertaking the project and the characteristics of the project. Given the effect of construction risks on project duration, quality, and budgeting, construction project managers must thoroughly understand the risks involved in and characteristics of a construction project [5]. Studies have mainly conducted literature reviews, questionnaire surveys, and expert interviews to identify construction risk factors. [PERSON] and [PERSON] [6] performed a detailed review of the literature to identify 33 risks related to construction projects and devised a questionnaire to collect expert opinions on the probabilities and effects associated with these risks. [PERSON] and [PERSON] [1] conducted semistructured interviews and identified 10 key construction project risks, including delays in payments, client variations, design variations, inaccurate cost estimates, and tight project schedules. [PERSON] et al. [7] reviewed the literature and conducted a questionnaire survey to identify 12 key risk factors in the construction of underground metro stations. [PERSON] and [PERSON] [8] referenced the opinions of experts who possessed abundant knowledge on international construction projects and used factor analysis to determine concrete risk factors. [PERSON] et al. [9] invited experts to an on-site seminar to identify 20 key construction risks and divided the identified risks into personnel, device, material, environment, and supervision. For complicated and uncertain large-scale construction projects, information from various dimensions and subsystems is recorded during the construction process to mitigate risks [10]. The analysis of risk incidents is highly dependent on the quality of records; problems in recording and heterogeneity in incident data might result in conflicts when analyzing the relationship between attributes [11]. Because all the aforementioned studies adopted a short data collection period, they failed to analyze systematic risks. Moreover, some of these studies obtained data through literature reviews, which resulted in inconsistent research designs for investigating risk factors. Furthermore, the questionnaires administered to the research participants in the relevant aforementioned studies were vulnerable to subjective interpretation. To overcome the aforementioned disadvantages, 948 construction auditing records from 1993 to 2020 were collected for analysis in the present study.