By using consored、some moment inequalities of negatively associated random variables and other relevant knowledge, as the bridge to extend some limit nature of identically and negatively associated random variables to negatively associated random variables, we use stochastic controls obtain several conclusions of the negatively associated random variables.

The correlation sequences play an important role in the modern communication system and get more and more important with the development of communication technology: good autocorrelation property of the sequence in a communication system can improve the performance of the detector and a communication system can resist against the interference between codes if the used codes have.

We also get an index measuring dynamic investment value of the risky asset,which can reflect the impact of serial correlations of re.

This paper uses the main trade contracts of three commodity futures markets in China as the research sb- jects,carries out the empirical analysis on the futures earning ratio by means of unit root test and serial correlation test.

Heteroscedasticity and serial correlation are theoretically analyzed on their inconsistency with the important assumptions of the econometric models.