one sided upper approximate limit

The relation between limit from the left(or right) and Schwarz derivative are obtained,and an inequation is built with Schwarz derivative.

研究Schwarz导数,在已有成果基础上给出了在一点单侧极限与Schwarz导数的关系,以及一定条件下,由Schwarz导数构成的不等式。

An approximate maximum likelihood method is adopted for estimating ARMAX model parameters.

采用近似极大似然法估计ARMAX模型系数 ,克服了传统极大似然估计方法的高度计算复杂性 ,需要对参数的初值进行猜测的缺点。