Abstract
This paper mainly studies the parameters of active panel data. According to the activity panel data to create a balance model, through the use of two improved GMM evaluation algorithm and according to the original GMM evaluation algorithm, the activity panel regression model creation, and dynamic activity panel parameter evaluation creation process. Based on the research and analysis of groundwater exploitation and other related literature, this paper believes that the reasonable development and utilization of groundwater resources in the island is a major problem to be solved in the development process of groundwater resources. Therefore, in the shallow groundwater area, it plays a very important role in the protection of groundwater resources. There is a very close relationship between surface water and groundwater, and surface water and groundwater can interact and influence each other, making the water quality change to a certain extent. Groundwater is the main source of water supply in China. According to the literature, athletes have good physical fitness, which can help athletes get better results in the competition. Through the research and analysis of high-level tennis players’ physical fitness, we can find more scientific and effective training methods, and make the high-level athletes’ physical energy supply more comprehensive and reasonable, so as to improve the sports level and competitive ability of athletes. In this paper, through the study of traditional GMM evaluation algorithm, the parameters of regression model and data model can be accurately estimated by activity panel.
Highlights
Panel data can be called mixed data, mainly refers to a group of data forms obtained by integrating panel data and time series
It can be found that groundwater is generally affected by weather and season, and the circulation of water supply is relatively stable and efficient
There is a great gap between the overall level of tennis in China and the overall level of tennis in developed countries in the world
Summary
Panel data can be called mixed data, mainly refers to a group of data forms obtained by integrating panel data and time series. For the men’s tennis in China, there are many technical problems and technical difficulties such as technical defects, and there are very big deficiencies in the physical fitness of athletes. Physical training is a main training item in the process of athletes’ sports. Athletes are high-intensity and overload training in ordinary training If they lack physical ability, they will make the effect of sports training greatly reduced, so that the athletes’ sports skills and skills cannot be effectively improved. The sufficient physical ability and scientific physical training can help athletes improve the efficiency and extend the time of sports. This paper studies and analyzes the physical fitness of athletes, and finds more scientific and effective training methods to improve athletes’ sports skills and physical fitness
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