摘要
本文利用叉积比给出了各种三维对数线性模型的严格数量解释，从另一角度反映了对数线性模型的意义。同时证明过程中提出的两个引理，独立地看，也是很有意义的。
The cross-product ratio to explain the three-dimension log-linear model is discussed, which reflects the real meaning of log-linear model. O therwise, the two lemmas are achieved finally.
关键词
对数线性模型
叉积比
独立
概率
Log-linear model
Cross-product ratio
Independence
