1, Introduction
At present, the information collected by China's construction market is more and more extensive, especially in some relatively developed cities, whose informatization has reached the level of industrialization. At the same time, in some small and medium-sized cities, the process of collecting information and the mechanism of releasing information are mostly a mere formality, with poor accuracy. At this time, correlation analysis has played its unique charm in revealing the relationship between data objects. Based on the information price of materials in the construction market, the research method of correlation analysis is adopted to improve the accuracy of the information price of materials.
2. Research objects and research methods.
2. 1 research methods. Correlation analysis is a statistical method to study the relationship between variables. Correlation reflects the interdependence between real phenomena, but the relationship value is not fixed. This concept shows that correlation means that there is a quantitative interdependence between phenomena, but the specific relationship value of this interdependence is not fixed [2]. If the numerical accuracy of a variable is high, the accuracy of the studied object can be determined by correlation analysis. Correlation coefficient is a measure of the close relationship between variables. The measure of linear correlation between two variables is called single correlation coefficient. The correlation coefficient of samples is generally expressed by R, and its value is generally between-1 and 1.
2.2 Selection of research objects. Usually, there are many kinds of materials involved in construction projects, and it is complicated to sort out and study them. Correlation analysis can't analyze the information price of all building materials. Therefore, this paper divides building materials into two aspects, namely, large circulation materials and local materials, and the correlation analysis is only aimed at materials that can be widely circulated throughout the country. In this paper, large circulation materials refer to materials that can be used nationwide, regardless of material prices. The accuracy of project cost information depends largely on the price of these large circulation materials. The big recycling material in a project is the skeleton. Once the construction cost of the skeleton is accurate, the whole project will be more than half successful. This paper takes the most representative steel in large circulation materials as the research object.
3. Example and result analysis.
3. 1 Example. In this paper, the historical data of Ganzhou city is selected to study the price of material information. Ganzhou's economic development level is relatively backward in the whole country. Therefore, we should consider that the higher the economic level of a city, the more perfect its work in cost information and the more transparent its price information, and the greater the reference value we get. Therefore, considering this factor, this paper chooses Shenzhen as a sample city. On the other hand, considering the influence of geographical location, Ganzhou's steel mainly comes from Nanchang Iron and Steel, Xinyu Iron and Steel and Shaoguan Iron and Steel. The output and quality of Xinyu Iron and Steel have great influence in the whole country. Therefore, the information price of Xinyu Iron and Steel should be relatively more accurate and transparent.
3.2 Analysis of results. On the whole, 20 13 Ganzhou steel information price fluctuates within a certain range. The price peaked in February, which was more obvious than 1 month. In addition, the price increases in August and 165438+ 10 were also obvious. According to the data in June, its price reached the lowest in the whole year. It is not difficult to see that the rise and fall of steel prices in Ganzhou is not only related to the steel prices in Xinyu and Shenzhen, but also related to the best construction period in the construction industry. From a national perspective, steel prices are affected by many factors, such as the relationship between supply and demand, the level of import and export, and the development of the real estate industry.
This paper speculates that the main driving factor affecting the steel price in Ganzhou is the balance between supply and demand. On the one hand, the development of construction industry in the surrounding cities of Ganzhou will lead to the increase of steel demand, so the steel supply place like Xinyu will raise the steel price, thus affecting the information price of Ganzhou steel; On the other hand, influenced by climate and other factors in Ganzhou, there are off-season and peak season in a year. In the off-season, the demand for steel in Ganzhou decreases, which naturally leads to its price reduction, and vice versa. In addition to selecting the price information of different cities for relevant analysis, we can also combine the prices of some large-scale circulating materials in Ganzhou and some large brand companies for relevant research. For example, when analyzing the price of pipes and tubes, we must consider that Fujian Yatong Pipe Industry is the pillar brand of Ganzhou, and the price information regularly released by Fujian Yatong must be taken into account when making corresponding analysis.
The above are collected and sorted by Zhong Da Consulting Company.
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