英语语法分析

Results were analyzed by t test and Bivariate correlation.

结果进行t检验及直线相关分析。

Objective: To study a bivariate risk model with variable premium rate.

前言：目的研究一类可变保费的双险种风险模型。

Objective To analyze the partial correlation problems by multilevel bivariate models.

目的探讨利用双变量多水平模型分析多重相关中的部分相关问题。