上周学习了点SAS数值精度方面的问题，觉得这相关内容还是很值得发掘的，自己小做了个PPT，目录如下： 1.Two aspects of numeric data in SAS 2.Floating-point (real binary) Floating point representation Concepts IEEE system A Example 3.Numeric precision: Integer Problem: LENGTH statement Reason Solution 4.Numeric precision: Fraction Problem: LENGTH statement Reason Solution 5.Other considerations Exception Formula transmutation 6.Conclusions ppt文件：numeric precision in SAS(by hssnow)
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