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。
SPSS was better than SAS in testing of proportional hazards assumption, but in detecting the influential points SAS was better.
SAS和SPSS的诊断功能基本相近，比例风险假定的考察SPSS略优于SAS，影响点的识别SAS优于SPSS。
SPSS was better than SAS in testing of proportional hazards assumption, but in detecting the influential points SAS was better.
SAS和SPSS的诊断功能基本相近，比例风险假定的考察SPSS略优于SAS，影响点的识别SAS优于SPSS。
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