In the development of urban construction, regional economic differences have always been the focus of the government, society and academia. As an eastern coastal province in China, although Jiangsu has a relatively high level of economic development from an overall point of view, there is still a serious problem of regional economic disparity within it. Therefore, based on the development of local economic construction and the understanding of the phenomenon of industrial transfer, this paper uses a multiple regression model to study the regional economic coordination and thus puts forward appropriate solutions.

#### Keywords

- Multiple regression
- Industrial transfer
- Regional economy
- coordination

#### MSC 2010

- 76U05

Simple speaking, refers to the enterprise as the main body of industry transformation of the economic activity, belongs to a country or region in order to promote the industry innovation, factors such as the condition of resource supply or demand change, part in the mature industry, innovation, or recession stage of development from one country or area to another country or region of a kind of economic behaviour. The specific mechanism is shown in the figure below:

Based on the framework of neoclassical ideas, the corresponding mathematical model analysis shows that suppose there are only two countries in the world, namely country A and country B and labour as the only factor of production, there are only two kinds of products, namely product 1 and product 2. Within the country, the products produced by all enterprises have the same production function, and the markets of each country are perfectly competitive. In the case of clear production function _{ij}_{ij}_{ij}_{ij}_{ij}

In the case of the same propensity to consume products, it is assumed that the income of product I in country _{j}_{ij}

According to the analysis of the above formula, the sum of the number of enterprises in the industry I in country

According to the analysis of the economic development situation of the north and south of Jiangsu area at present, due to its regional advantages, in the process of industrial innovation and continuous expansion of industrial scale, enterprises in the southern region have gradually gathered. In this way, they can not only obtain more professional products and services but also build a shared labour market. Although the northern region has also achieved certain economic benefits, the overall development level has decreased significantly compared with the southern region. Especially after entering into the 1990s, the economic differences between the north and the south became more and more obvious and gradually formed a ladder development situation from the south to the north. Such unbalanced development has led to serious imbalances in infrastructure, medical investment and education levels in both regions. Nowadays, the land cost and labour force in people's areas are increasing with the economic development, and the overall consumption level is also increasing. Moreover, with the expansion of the industrial scale, development problems such as environmental pollution and resource shortage are gradually introduced. In this context, transferring some industries to the northern region and sharing them with the southern economic development can not only solve the problems of the current industrial economic development but also promote the pace of economic construction and innovation in the northern region [3].

By studying the strength of the economic connection between the two regions, it can be seen that the degree of economic connection between the two regions is directly proportional to the mass of the two regions and inversely proportional to the distance between the centres of the two regions. Consider building a model as shown below:
_{t}_{n}_{S}_{N}_{S}

Combined with the investigation and analysis of the strength of the regional economic connection between the two sides in recent years, we can see that it has been showing a gradual upward trend. This also proves the importance of industrial transfer in economic development and industrial upgrading.

The classical multiple regression model is shown as follows:
_{1}, _{2}... The linear relationship between.

Since there are few cases of a linear relationship between predictors and factors in actual data and most of them are non-linear, in order to expand the application range of the model, factors will be transformed based on several forms of function transformation and then selected by means of stepwise regression. The details are as follows:

First of all, it is necessary to define the function conversion form that can be selected based on the physical background of the data:

Linear function:

Hyperbolic function:

Power function: ^{B}

Logarithmic function:

Exponential function:

Fractional exponential function:

Second, for _{i}_{i}_{1}, _{2}, _{3} . . . YP implements stepwise regression and builds _{1}, _{2}, _{3}... The nonlinear multiple regression model of XP.

In this method, only 6p unary regression is needed to select the function transformation form of the factors.

In the derivation of model establishment, the southern and northern parts of Jiangsu were taken as the whole regional economy for in-depth discussion and the production function equation as shown below can be obtained, respectively:

In the above formula, _{t}_{t}_{St}_{Bt}_{St}_{Bt}

At the same time, since the externalities of industrial transfer in both regions can only be reflected after a period of time, the formula can be obtained as follows:

In this paper, the adaptive expectation model is used to optimise the above contents. Assuming that there is no relationship between the expected external influencing factor and _{t}

In the above formula, 0 < _{t}_{j}

Thus, the production function of the two regions is substituted into the formula to obtain the total differential, and the following can be obtained:

At this point, it is assumed that the marginal elements of the two regions are different, so it can be concluded that:

Substituting the above two formulas into the analysis, we can get:

In the above formula, _{t}

If there is a linear relationship between the marginal production efficiency of labour and the per capita production within the scope of the overall economy, then we can get:

Substituting it into the above formula and dividing both sides of the equation by _{t}

Combined with the production function formula analysis of the southern region, the influence of the externality of local output transfer on the total production quantity in the northern region conforms to the following conditions:

By continuing to deduce and analyse the above formula, the marginal production efficiency of the external influencing factor can be determined. The specific formula is as follows:

Putting the above formula into the linear relationship between the marginal productivity of labour and the scope of the overall economy, we can get:

Further recursive iteration processing is carried out for the external impact factor, and the following can be obtained:

The above formula satisfies the condition of

It represents the basic dynamic externality model studied in this paper.

According to the analysis of the basic dynamic externality model, multiplying both sides of it by _{t}

In the above formula,

In this study, Eviews5.0 software was used to conduct regression processing on all local data information from 1990 to 2020. Table 1 shows the GDP ranking results of 13 cities in Jiangsu Province in 2020. By evaluating the development experience of the two places, the externality of industrial transfer from the south to the north is analysed, and the final results are as follows:

GDP ranking results of 13 cities in Jiangsu Province in 2020

1 | Suzhou | 20170.50 | 3.40 |

2 | Nanjing | 14817.95 | 4.60 |

3 | Wuxi | 12370.48 | 3.70 |

4 | Nantong | 10036.31 | 4.70 |

5 | Changzhou | 7805.30 | 4.50 |

6 | Xuzhou | 7319.77 | 3.40 |

7 | Yangzhou | Breakthrough 6000 | 3.50 |

8 | Yancheng | 5953.38 | 3.50 |

9 | Taizhou | 5312.77 | 3.60 |

10 | Zhenjiang | 4220.09 | 3.50 |

11 | Huaian | Breakthrough 4000 | 3.00 |

12 | Lianyungang | 3277.07 | 3.00 |

13 | Suqian | 3262.37 | 4.50 |

Combined with the above formula analysis, it can be seen that the equation fits well, and the goodness of fit can reach 0.999994, and the

The final result shows that the industrial development in the southern region has a low impact on the economic development in the northern region based on the industrial agglomeration phenomenon, so the industrial transfer is not coordinated now. At the same time, the labour productivity constituted by the two is also the main reason for the differences in industrial development. Based on the analysis of practical data, taking the GDP growth rates of the two places in 2018, 2019 and 2020 as examples, the overall development level of all regions has been improved under the influence of the concept of industrial transfer. In this background, the civil labour productivity ratio reached 4:1; in other words, the south region of labour costs three times up to that of the north region. Hence for the rapid development of the economy, the north area can never rely on the south region economic externality and should make full use of its advantages, the development of the practice development breakthrough of the blind spot. At the same time, the northern region should correctly understand the importance of industrial transfer and pay attention to fully show the flexibility of production factors in practice and exploration, so as to promote the coordination of regional economic development faster.

Comparison of GDP increment in the first half of 2018 and the first half of 2019 (100 million yuan)

1 | Nanjing | 6742.59 | 6201.08 | 541.51 | 8.73 |

2 | Wuxi | 5962.51 | 5535.66 | 426.85 | 7.71 |

3 | Xuzhou | 3540.76 | 3318.09 | 222.67 | 6.71 |

4 | Changzhou | 3765.6 | 3506.7 | 258.9 | 7.38 |

5 | Suzhou | 8548.27 | 9109.71 | 438.56 | 4.81 |

6 | Nantong | 4580.11 | 4262.8 | 317.31 | 7.44 |

7 | Lianyungang | 1446.89 | 1398.67 | 48.22 | 3.45 |

8 | Huaian | 1956.1 | 1845.71 | 110.39 | 5.98 |

9 | Yancheng | 2885.11 | 2721.13 | 163.98 | 6.03 |

10 | Yangzhou | 2804.57 | 2642.48 | 162.09 | 6.13 |

11 | Zhenjiang | 2216.3 | 2118.95 | 97.35 | 4.59 |

12 | Taizhou | 2732.15 | 2507.57 | 224.58 | 8.96 |

13 | Suqian | 1408.56 | 1304.88 | 103.68 | 7.59 |

Comparison of GDP increment in the first half of 2019 and the first half of 2020 (100 million yuan)

1 | Suzhou | 9050.24 | 9548.27 | −498.03 | −5.22 |

2 | Nanjing | 6612.35 | 6742.59 | −130.24 | −1.93 |

3 | Wuxi | 5516.32 | 5962.51 | −446.19 | −7.48 |

4 | Nantong | 4664.35 | 4580.11 | 84.24 | 1.84 |

5 | Changzhou | 3471.01 | 3765.60 | −294.59 | −7.82 |

6 | Xuzhou | 3074.05 | 3540.76 | −446.71 | −13.18 |

7 | Yancheng | 2686.02 | 2885.11 | −199.09 | −6.90 |

8 | Yangzhou | 2653.80 | 2804.57 | −150.77 | −5.38 |

9 | Taizhou | 2401.73 | 2732.15 | −330.42 | −12.09 |

10 | Zhenjiang | 2026.61 | 2216.30 | −189.69 | −8.56 |

11 | Huaian | 1849.43 | 1956.10 | −106.67 | −5.45 |

12 | Lianyungang | 1417.69 | 1446.89 | −29.2 | −2.02 |

13 | Suqian | 1399.40 | 1408.56 | −9.16 | −0.65 |

Generally speaking, the coordinated development of regional economy between the north and south of Jiangsu refers to mutual assistance and coordination between regions, which conforms to the principle of comprehensive interests. According to the analysis of the research results outlined in this paper, the following work should be done well in the coordinated development of industrial transfer in the northern region of Jiangsu Province: first, continuously optimise the labour production efficiency in the less developed regions. Due to the imbalance in the level of market development between the north and the south, the production factors such as talent information and technology funds will concentrate in the south. Once the flow effect reaches a certain level, it will be difficult for the less developed regions to change the situation. Therefore, in the context of the new era, it is necessary to break through the development restrictions between the two places and pay attention to the construction of a unified regional development of the big market to ensure that the production factors can be flexibly used and the industrial transfer within the region. On the one hand, we can use the coercive cooperative relationship to promote the rectification; on the other hand, we should actively participate in the economic radiation and fully grasp the change rules of the market economy so as to ensure the full integration of the factors of production in the north and the south. Second, make full use of regional advantages to develop new industries. The land and labour resources in the northern region are very rich, and the prices of actual production factors are relatively low, which can provide convenient conditions for the industrial transfer and the development of labour-intensive industries. At the same time, the northern region also has more mineral resources, biological resources, Marine resources, etc., which also plays a positive role in the development of the resource-processing industry. Third, the government should put forward preferential support policies. On the one hand, we should provide conditions for some returning migrant workers, pay attention to increasing the types of industries of local enterprises and provide necessary services for their industrial transfer. On the other hand, we should break through administrative restrictions and build a unified market environment. Only in this way can we ensure the free flow of various factors within the market. At the same time, the construction level of the local soft environment should be optimised. For example, paying attention to the construction of strict law enforcement and a fair and equitable legal environment, creating equality, mutual benefit, harmonious and friendly policy environment can provide a basic guarantee for professional transfer [4, 5].

To sum up, although based on the multiple regression model of industry transfer and regional economic coordination, the research has obtained certain results, because of the economic development and the market environment's instability contains the influence of many factors, the practice research is still at the primary stage, which requires relevant researchers to continue to explore in practice development and analysis. At the same time, based on the construction and development needs of the new era, it is necessary to vigorously cultivate excellent technical talents, rationally use the modern technology concept and pay attention to improving the control strength inside and outside the market. Only in this way can it provide an effective basis for the practice of industrial transfer [6, 7].

#### GDP ranking results of 13 cities in Jiangsu Province in 2020

1 | Suzhou | 20170.50 | 3.40 |

2 | Nanjing | 14817.95 | 4.60 |

3 | Wuxi | 12370.48 | 3.70 |

4 | Nantong | 10036.31 | 4.70 |

5 | Changzhou | 7805.30 | 4.50 |

6 | Xuzhou | 7319.77 | 3.40 |

7 | Yangzhou | Breakthrough 6000 | 3.50 |

8 | Yancheng | 5953.38 | 3.50 |

9 | Taizhou | 5312.77 | 3.60 |

10 | Zhenjiang | 4220.09 | 3.50 |

11 | Huaian | Breakthrough 4000 | 3.00 |

12 | Lianyungang | 3277.07 | 3.00 |

13 | Suqian | 3262.37 | 4.50 |

#### Comparison of GDP increment in the first half of 2019 and the first half of 2020 (100 million yuan)

1 | Suzhou | 9050.24 | 9548.27 | −498.03 | −5.22 |

2 | Nanjing | 6612.35 | 6742.59 | −130.24 | −1.93 |

3 | Wuxi | 5516.32 | 5962.51 | −446.19 | −7.48 |

4 | Nantong | 4664.35 | 4580.11 | 84.24 | 1.84 |

5 | Changzhou | 3471.01 | 3765.60 | −294.59 | −7.82 |

6 | Xuzhou | 3074.05 | 3540.76 | −446.71 | −13.18 |

7 | Yancheng | 2686.02 | 2885.11 | −199.09 | −6.90 |

8 | Yangzhou | 2653.80 | 2804.57 | −150.77 | −5.38 |

9 | Taizhou | 2401.73 | 2732.15 | −330.42 | −12.09 |

10 | Zhenjiang | 2026.61 | 2216.30 | −189.69 | −8.56 |

11 | Huaian | 1849.43 | 1956.10 | −106.67 | −5.45 |

12 | Lianyungang | 1417.69 | 1446.89 | −29.2 | −2.02 |

13 | Suqian | 1399.40 | 1408.56 | −9.16 | −0.65 |

#### Comparison of GDP increment in the first half of 2018 and the first half of 2019 (100 million yuan)

1 | Nanjing | 6742.59 | 6201.08 | 541.51 | 8.73 |

2 | Wuxi | 5962.51 | 5535.66 | 426.85 | 7.71 |

3 | Xuzhou | 3540.76 | 3318.09 | 222.67 | 6.71 |

4 | Changzhou | 3765.6 | 3506.7 | 258.9 | 7.38 |

5 | Suzhou | 8548.27 | 9109.71 | 438.56 | 4.81 |

6 | Nantong | 4580.11 | 4262.8 | 317.31 | 7.44 |

7 | Lianyungang | 1446.89 | 1398.67 | 48.22 | 3.45 |

8 | Huaian | 1956.1 | 1845.71 | 110.39 | 5.98 |

9 | Yancheng | 2885.11 | 2721.13 | 163.98 | 6.03 |

10 | Yangzhou | 2804.57 | 2642.48 | 162.09 | 6.13 |

11 | Zhenjiang | 2216.3 | 2118.95 | 97.35 | 4.59 |

12 | Taizhou | 2732.15 | 2507.57 | 224.58 | 8.96 |

13 | Suqian | 1408.56 | 1304.88 | 103.68 | 7.59 |

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