Enterprise Financial Risk Prevention and Control and Data Analysis Method Based on Blockchain Technology

Table 2

Descriptive statistical results of the closing prices of the CSI 200 Index.

Shanghai and Shenzhen Index	Sample	Training samples	Test sample
Sample size	3600	3500	100
Mean	2484.978	2469.469	3141.435
Standard deviation	1197.83	1183.76	89.56
Covariance	1227865	1246789	8018.635