Valuation analysis of Chinese and American listed companies based on mathematical model

With the development of China's economic globalization, the stock market gradually reflects its important position in the development of China's market economy. First of all, this paper selects the average market sales rate as the valuation level, and uses the evaluation model to calculate the valuation level of China's A-share market and the US Nasdaq market in 2018, and calculates the valuation premium or discount level of these two markets. Secondly, a multiple linear regression model is established to quantitatively analyze the relationship among valuation index, fundamental index and liquidity index in China's A-share market and American Nasdaq market. Then, the grey prediction mathematical model is established to forecast and analyze the fundamental index and liquidity index of China's A-share market and American Nasdaq market in 2019; according to the prediction results, the valuation indexes of these two markets in 2019 are calculated. Finally, the paper uses SVM model to predict the valuation level of the first batch of enterprises listed on the science and technology innovation board. The results show that the market sales ratio of the first batch of enterprises on the science and technology innovation board fluctuates about 5 times, which is smaller than that of the United States, indicating that China's stock market has great potential.