Housing Sources of Second-Tier Urban Residents Based on Multivariate Correspondence

To explore the relationship between different housing sources and individual attributes in second-tier cities, finding the key point of contradiction between supply and demand in the real estate market is important. Multivariate correspondence analysis (MCA) is a powerful method to solve the complex problem of the relationship between classified variables. Also known as corresponding analysis, it is a multivariate statistical analysis method that aims to describe the relationship between two classification variables in a corresponding table in a low-dimensional space. MCA has unique advantages when dealing with categorical variable data. It combines the advantages of factor analysis and multidimensional scaling. On the basis of combining and analysing the existing literature, this paper makes an analysis of the data obtained from a housing questionnaire survey collected in Jinan, Shandong Province, in 2017. -e research results show that the housing sources of second-tier urban residents are closely related to age, annual family income, marriage, education level, and individual characteristics of the permanent family population but not to gender.


Introduction
In the past decade, the Chinese real estate market has developed rapidly, and the development of the second-tier city has become a significant part of this market [1][2][3]. As a group, the second-tier city real estate market has a crucial effect on the development of the whole economic market because it has a massive population size, great virtue of economic strength, and control of the ground, which can become the nucleus from which to lead the evolution of the real estate market system [4][5][6]. us, it is more than significant for us to correctly understand the strategic position, development trends, and development phases of the secondtier city's real estate market within the entire Chinese market [7][8][9]. e second-tier city is a variational concept and will thus be different throughout its different phases [10][11][12].
is article defines a second-tier city as a city comprised of a large scale within its province, excluding the first-tier cities (e.g., Beijing, Shanghai, Guangzhou, and Shenzhen). is research's object is Jinan, which is the capital city of Shandong Province and the province's centre of the politics, economy, culture, financing, transportation, and education. It also has many springs in the downtown area, such as "72 MingQuan" and the "Baotu Spring," which is called the first spring in the world and is the reason why Jinan is called the City of the Spring. Jinan is the national historical and cultural city of China and contains mountains, lakes, and numerous lotus plants and willows. In 2017, the statistics of the Newspaper of National Economy and Society Development revealed that, in Jinan, the real estate market investment has increased slowly. is investment has reached 123.26 billion yuan, increasing by 5.9%, and among these investments, the residential building investments have reached 82.28 billion yuan, increasing by 2.1%. e total building construction consists of 80.068 million square metres, increasing by 1.2%; among this construction, the total residential construction consists of 53.289 million square metres, increasing by 1.6%. e completed buildings consist of 6.313 million square metres, among which the completed residential buildings consist of 4.911 million square metres. e control and adjustment of the real estate market have evident effectiveness [13][14][15]. e total portion of the sold commodity housing is 121.53 million square metres, decreasing by 14.7%; among this total, the portion of the sold residential housing is 97.37 million square metres, decreasing by 20.9%. e total sales of commodity housing have reached 117.26 billion yuan, decreasing by 0.2%; among these sales, the total sales of residential housing have reached 94.63 billion yuan, decreasing by 8.6%. On the one hand, the increase in sales in the area reflects the continued rise in inventory under dull market transactions and the continued game between real estate companies and home buyers. On the other hand, many studies have paid more attention to first-tier cities rather than second-tier cities. is article will mainly pay attention to the connection between the housing source and the citizen in Jinan, Shandong Province, and determine its mechanisms. at is why we chose Jinan as the research object.

Literature
e real estate market in China has had explosive development since the housing system reform of 1998 [15][16][17]. People have various ways of obtaining a house, such as selfbuilt housing, purchasing commodity housing, purchasing affordable housing, purchasing public-owned housing, renting public-owned housing, and renting commodity housing, instead of depending on the government's welfare housing [18][19][20]. Many domestic and overseas scholars have researched the connection between housing sources and individual attributes and have found many consistent conclusions. In 1980, Lhlanfeldt posited that, in the life cycle stage, consumer individual attributes such as actual normal income, race, and occupation were the basic factors to be considered in the decision to buy a house, and older age, marriage, and large family size all contributed to home ownership [21]. In terms of family economic status, in 1977, Michelson studied how families choose houses and the search process for residential location. He discovered that financial status was the main factor affecting family migration, while education level affected family life style [21]. e above two factors were highly correlated with residential location selection. Jun used correspondence analysis and optimal scales to conduct empirical research and analysis on consumer behaviour in the housing market and concluded that monthly income is closely related to housing [22]. Fen used a multivariate statistical method to analyse the housing consumption of urban residents in Tianjin [23]. e research results suggested that the annual household income is the main factor affecting the purchase standard, and consumers with an annual income of 80,000 to 100,000 yuan tend to buy 90 to 120 square metres of housing. In 2010, Liu et al. analysed the housing type differentiation transformation under the background of China's urban residents and its influencing factors. is research found that since the reform and opening up, China's urban housing ownership rate has increased significantly and that variables such as family life cycle, family income, household register, work-unit properties, and profession significantly influence the housing choice and reflect the market and the system of the dual effects of housing resources allocation [24]. Qian conducted relevant research on the demand preference of housing types and performed corresponding analysis and multidimensional preference analysis results of the secondtier city of Baoding with SPSS software [25].
is research found that disposable income, the market housing ratio, the commercial housing ratio, the purchase of commercial housing (which has its own ratio), and self-built housing [26] are not significant, except that public housing has its own correlation coefficient at the p < 0.01 level. Housing property rights are related not only to income but also to housing prices [27]. Generally, in the market economy, people will have a stronger housing affordability when their income is higher [28,29]. e means of housing acquisition, housing differences, and the results of housing stratification often interact with each other, among which occupation, education, income, and family life cycle are important influencing factors. Marriage and birth status are important factors affecting the housing source of urban youth [30,31]. Marriage and birth as important life events significantly improve the possibility of young people purchasing a house [32,33]. Foreign scholars have carried out research based on a variety of research perspectives and methods of residential housing sources in the market; for example, Jayasekare posits that houses with desired aesthetic views have a price premium over similar houses without such views [34]. Currently, some researchers are studying the connection between environmental protection and housing prices. Due to the prevailing environmental protection concept, green building and green construction will increase the cost of construction companies and affect the price [35]. According to statistics, approximately 30-40% of total raw material and final use are consumed by the construction industry, which proves that material makes a large proportion of this industry [21,22]. Meanwhile, green construction, which was the concept of sustainable development, also appeared in the construction industry and, according to Jun [34], aims to protect nature by reducing the building impacts on the environment and will increase the price of housing. Furthermore, many green constructions have been stopped because of their additional cost and extra time [36], and this difficulty has become the main factor obstructing the development of technology and influencing the price.
However, by not using multiple correspondence analysis to determine the individual attribute characteristics and the source of urban housing, the study of the source of housing is relatively small; therefore, careful study is needed to determine the source of urban housing and its closely related attributes, as well as to explore the housing source and the link between residents' property and regularity.
Correspondence analysis is a powerful tool for the analysis of categorical variables [37]. It is a visual data analysis method that can display groups of data without any connection through visually acceptable positioning maps [38,39].
is method uses the idea of dimensionality 2 Advances in Civil Engineering reduction to simplify the data structure [38,40]. It is simple and intuitive and is widely used in the fields of market segmentation, product positioning, geological research, and computer engineering [39,41]. is paper applies multivariate correspondence analysis (described as the correspondence between three or more variables) to the analysis and evaluation of individual attributes and housing sources.
eoretically, this use broadens the research field of correspondence analysis. From the perspective of application, it provides a theoretical basis for promoting the stable development of the real estate market. Based on this, this study starts from housing sources in second-tier cities and applies the method of multiple correspondence analysis to classify housing sources from different channels, thereby providing theoretical support for the classified management of national real estate management departments.
us, the current study provides a theoretical basis and path reference for the government's macro control.

The Hypothesis
Based on existing theories and the current situation of China's housing market, this paper proposes a relationship between the individual attributes and housing sources of urban residents. To facilitate questionnaire research, the hypotheses of the corresponding variables, including gender, age, education level, marriage, occupation, family resident population, family annual income, and housing source, are preliminarily determined on the basis of summarizing and absorbing existing research results. Among these variables, the seven variables of gender, age, education level, marriage, occupational family, permanent resident population, and family income can be described as individual attribute characteristics. Housing sources can be divided into the following five types: renting a house, living with parents, purchasing commodity housing, purchasing affordable housing, and other types of housing.
is paper mainly studies the relationship between these seven individual attributes and five housing sources. is article proposes the following seven hypotheses: (1) men are more likely than women to purchase houses; (2) older people are more likely than young adults to purchase houses; (3) the more educated people are, the more likely they are to buy a house; (4) married people are more likely to buy a house than unmarried people; (5) people with stable jobs are more likely to buy a house; (6) the larger the number of family residents, the more likely the family will buy a house; and (7) the higher the annual household income, the more tendency the family has to buy a house. e classification of eight variables (see Table 1) was conducted, and the multivariate correspondence analysis of these eight variables was conducted to explore the characteristics and regularities of urban residents' housing sources in Jinan, which is a second-tier city in Shandong Province.

Data Source and Processing.
Before the formal release of a questionnaire on a large scale and to test its initial consistency and validity, a questionnaire needs to be pretested on a small scale. By utilizing the data from the pretest, by examining the reliability and validity of the questionnaire to better formulate the measurement items and by communicating with the respondents to better understand their questions about the structure, methods, and so on of this questionnaire, the questionnaire was more effective in obtaining the required data, and the quality of the questionnaire was improved. For subsequent empirical analysis, the results provide strong results.
In the pretest of this questionnaire, paper and e-mail questionnaires were mainly distributed to randomly distributed individuals in each residential district. Specifically, after a housing questionnaire of urban residents was conducted following interviews with real estate experts, a questionnaire survey of urban residents in Jinan city, Shandong Province, was conducted using a household survey. A total of 300 copies of the pretest questionnaire were distributed, and 298 copies were returned, for a recovery rate of 99%. e pretest questionnaire was adjusted to a formal questionnaire by consulting experts and related professionals. To facilitate communication, a special housing questionnaire survey focus group was established, and the members of the group received professional training on the questionnaire survey. en, a large-scale face-to-face questionnaire survey was conducted in January 2017. e questionnaires were archived and numbered, and 1032 questionnaires were collected in the end.
rough manual screening, the questionnaires containing the same consecutive answers for 10 or more questions and those with missing data were removed from the sample. A total of 989 valid questionnaires were obtained, for an effective rate of 96%. respondents have a master's degree or above, accounting for 7.5%. In terms of work units, government institutions accounted for 18.2% of the respondents, state-owned enterprises accounted for 21.6% of the respondents, joint venture or foreign-funded enterprises accounted for 5.9% of the respondents, privately owned or private enterprises accounted for 29.1% of the respondents, and other units accounted for 25.2% of the respondents. In terms of household income, 58.9% of the respondents had a total household income below 100,000 yuan, 37.9% of the respondents had a total household income between 100,000 yuan and 350,000 yuan, and 3.1% of the respondents had a total household income above 350,000 yuan. In terms of living situation, 118 respondents rented a house, accounting for 11.9%; 299 respondents lived with their parents, accounting for 30.2%; 372 respondents had purchased commercial housing, accounting for 37.6%; 97  (1)

Current Characteristics of the Housing Consumption of
If the number of samples is lower than this difference, the maximum dimension is the number of samples. In this study, the maximum number of dimensions that can be selected is 26: (2) e characteristic root of each dimension represents the explanatory degree of each variable of the dimension. e larger the value is, the better the differentiation degree of each variable on the dimension is, and the maximum value is 1. However, due to the use of optimal scale transformation, the extraction of characteristic roots of each dimension is carried out independently, so it cannot represent the total interpretation degree of the model; that is to say, it is impossible to know the total interpretation degree of the model, which is the shortcoming of multivariate correspondence analysis based on optimal scale transformation. e output results from SPSS include the discriminating measures table and the discriminating measurement graph of the multivariate correspondence analysis. e graph shows the discriminating degree of each variable in two dimensions in the form of scatter coordinates. e size of the discriminating measure is between 0 and 1, and the higher the value, the higher the degree of differentiation. By analysing the discrimination measures of the multivariate correspondence analysis (Table 3) and the discrimination measurement graph (Figure 1), it can be seen that age has a high degree of discrimination in both dimensions, with an average value of 0.5065, which is the highest discrimination degree among all variables. Age is closely related to the housing source. e housing sources are also highly differentiated. Some of the other variables have a good degree of differentiation in the first dimension; for example, marriage has a good degree of differentiation in the first dimension; however, some variables have a better degree of differentiation in the second dimension, such as education and occupation. Family annual income and family resident population are well distinguished in the second dimension. However, gender has a poor and very small degree of differentiation in both dimensions. e smallest mean value of all the variables is 0.015. is is consistent with the actual situation, in which the type of house one lives in is closely related to their family situation and the annual income of their family, but not much related to their gender. e differentiation degree of the family permanent resident population is also very small. e mean value of the differentiation degree in the first and second dimensions is 0.097, which indicates that the family permanent resident population is not closely related to the source of housing.
In the multivariate correspondence analysis diagram (see Figure 2), different categories of the same variables that fall from the point of origin in the same direction and in the same area of the graph have similar properties. us, classes of different variables that fall from the point of origin near the same orientation and in the same region of the graph may be related. According to the principle of multivariate correspondence analysis, the differentiation degree of the same variable is first investigated. is process entails examining whether the row variables and column variables are clearly separated by category. ese differences can be examined separately in each dimension. If different categories of the same variable are close together in a certain direction, it means that these categories are not very different within this dimension. erefore, it can be seen from the figure above that the two variables of family annual income and age are far from each other, which indicates that family annual income and age are closely related to housing source, and the categories of occupations are close together in the graph, indicating that there is little difference between occupations. Generally, the classification points of different variables in roughly the same region are related to each other, as they fall from the same orientation point starting from the graph origin (0, 0). us, the closer the scattered points are, the more obvious the correlation tendency is. Based on this explanation, it can be seen from the chart that there is a close relationship between an annual income of the family below 50,000, an age of under 25, and renting or living with one's parents. ere is also a close relationship between an age from 35 to 50, an annual family income of 250,000 to 350,000, and a permanent family population of more than 5.
ose who work in state-owned enterprises or government institutions have a master's degree or above, the annual income of their families is between 180,000 yuan and 250,000 yuan, and they have a close connection with purchasing a commodity housing. ere is also a close correlation between a high school education and people over 50 Advances in Civil Engineering years old, which shows that the education of people over 50 years old is generally lower; in addition, more people over 50 years old report having welfare housing. e object scoring diagram is an individual scatter diagram (see Figure 3), which is used to display the distribution of all observations in the corresponding   interpretation space, and this graph can be used to assist in macro control. In this study, the observation distribution is relatively dense, which has significant research significance.

Conclusion
In this article, multiple correspondence analysis is adopted to analyse the identity and background characteristics of residents in second-tier cities and obtain numerous multiple corresponding analysis diagrams. Based on practical research experience, this paper explores the characteristics of the background identity and housing sources of residents in Jinan; at the same time, multivariate statistical analysis has the advantages of visualization. Meanwhile, the analytic method calculates the singular value and characteristic root in the process of analysis, quantifies the degree of interpretation of the total amount of information, and improves the scientificity of the results. is article uses a category or character variable in the process of analysing it, which expands the application field and scope of data analysis. e conclusions are as follows. Gender showed a lower degree of discrimination in the multivariate correspondence analysis. Gender is not a key factor affecting the source of housing, and both men and women need housing in cities. erefore, the relationship between gender and housing source is not very close, which is in part contrary to the ancient custom that men should provide housing for marriage.
Age was highly differentiated and closely correlated with the source of housing, showing the highest correlation. People aged between 35 and 50 are likely to buy affordable housing, which is closely related to the real estate marketization of 1998, as employers that have worked since 1998 no longer offer any welfare housing. At present, in terms of housing sources, people over the age of 50 basically have more than two houses, i.e., one welfare house and one commercial house or other type of house; in addition, most people under the age of 25 either live with their parents or rent a house.
Education is highly differentiated, and the analysis results suggest that most people over the age of 50 have high school education, while most people aged between 25 and 35 have a bachelor's degree or higher education. is further indicates the popularization of education for all and the improvement of academic qualifications.
ere is little correlation between a bachelor's degree and housing source, as most of the respondents have a high degree and a high income level and buy commercial housing.
Marriage shows a high degree of differentiation in the multivariate correspondence analysis. Most unmarried people tend to live with their parents and then get married or other situations closely related to the purchase of housing.
is is also consistent with Chinese customs, as most people tend to buy houses after they get married and have a family.
Occupation showed a high degree of differentiation in the multivariate correspondence analysis. e results show that the annual income of families in which the respondent works in private enterprises or private enterprises is between either 50,000 and 100,000 yuan or 250,000 and 350,000 yuan, which indicates that the income of private enterprises or private enterprises varies greatly. e annual income of families in which the respondent works in state-owned or state-owned enterprises is mostly 180,000 to 250,000 yuan, whereas the annual income of families in which the respondent works in government institutions is mostly 100,000 to 180,000 yuan. erefore, it can be seen that one's occupation is closely related to the annual income of their family.
e family permanent resident population shows a low degree of differentiation in the multivariate correspondence analysis. When the number of permanent family members is 1, individuals most often live with their parents. ose with more than 3 permanent family members are closely related to the purchase of affordable housing or commercial housing. It can be seen that after the increase of family members, most people choose to buy housing instead of renting a house. e annual household income shows a certain degree of differentiation in the multivariate correspondence analysis, but it is not the highest. However, there is a close correlation between family annual income and the purchase of commercial housing and affordable housing, which is consistent with the actual situation. Families with high annual income will naturally choose to buy a house rather than rent a house, which is closely related to people's ideology and concept of consumption concept. e analysis also shows that low household income is closely related to renting or living with one's parents.

Data Availability
e data used to support the findings of this study are available from the corresponding author upon request.

Conflicts of Interest
e authors declare that there are no conflicts of interest regarding the publication of this paper. Advances in Civil Engineering 7