In clinical research, the collected data cover quite of categorical variables.
在临床科研中,收集的数据中往往包含了一些分类变量。
Objective To sump up and extend COX regression model with categorical variables.
目的总结和推广包含分类变量的COX模型。
Simultaneously, categorical variables were compared with use of chi-square analysis.
同时使用卡方分析比较分类变量。
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