Data analysis was performed with STATA software package.
使用STATA统计软件包进行数据分析。
The first time I taught this class, it was a few years ago, was just before they built the Stata Center.
第一次我教这个课的时候，也就是几年前的时候，正是他们在设计建造Stata, Center的时候。
However, it can take a long time to learn and understand data management in SAS and many complex data management tasks can be done using simpler commands in Stata or SPSS.
可是学习掌握SAS数据管理需要花费很长时间，而且许多复杂的数据管理任务在Stata或者SPSS中只需要用简单的命令即可完成。
However, it can take a long time to learn and understand data management in SAS and many complex data management tasks can be done using simpler commands in Stata or SPSS.
可是学习掌握SAS数据管理需要花费很长时间，而且许多复杂的数据管理任务在Stata或者SPSS中只需要用简单的命令即可完成。
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