应用极限谱方法讨论ARMA(p,q)过程.得到此类过程生成的随机矩阵的样本协方差阵的极限谱分布及其密度函数,同时给出ARMA(1,1)情形下的密度函数具体的表达式.
The limiting spectral approach was used to discuss ARMA(p, q) processes and the limiting spectral distribution of sample covariance matrices generated by ARMA(p, q) process as well as the corresponding density functions were obtained. Meantime, the paper gived explicit expressions of the density functions of ARMA(1,1) processes.