Question

有没有办法检测SAS datastep期间是否对缺失值执行了操作？我看了所有automatic macro variables，但似乎没有人做我需要的。我不认为我可以设置SAS代码检查的严格性，以便NOTE: Missing values were generated...消息成为错误（可能会给&syscc一些值。）

示例代码：

data _null_;
foo=1;
bar=2;
baz=foo*bar;
put foo= bar= baz= "syscc=&syscc syserr=&syserr";
foo=.;
bar=2;
baz=foo*bar;  /*<-- at this point the note about missing values is generated */
/* Here I'd like to be able to do something like; */
/* if [SOME CONDITION] then do;
/*   put "operation on missing values occured!" _ALL_;
/*   [DO SOMETHING];
/* end; */
put foo= bar= baz= "syscc=&syscc syserr=&syserr";
foo=2;
bar=3;
baz=foo*bar;
put foo= bar= baz= "syscc=&syscc syserr=&syserr";
run;

日志输出（没有来源）：

FOO=1 BAR=2 BAZ=2 syscc=0 syserr=0
FOO=. BAR=2 BAZ=. syscc=0 syserr=0
FOO=2 BAR=3 BAZ=6 syscc=0 syserr=0
NOTE: Missing values were generated as a result of performing an operation on missing values.
      Each place is given by: (Number of times) at (Line):(Column).
      1 at 8:8
NOTE: DATA statement used (Total process time):

日志输出我想看：

FOO=1 BAR=2 BAZ=2 syscc=0 syserr=0
operation on missing values occured! FOO=. BAR=2 BAZ=. _ERROR_=0 _N_=1
FOO=. BAR=2 BAZ=. syscc=0 syserr=0
FOO=2 BAR=3 BAZ=6 syscc=0 syserr=0
NOTE: Missing values were generated as a result of performing an operation on missing values.
      Each place is given by: (Number of times) at (Line):(Column).
      1 at 8:8
NOTE: DATA statement used (Total process time):

我正在寻找这个（而不仅仅是检查单个变量的值）的原因是我从一个连续通过套接字收集数据的datastep中得到关于缺失值的很少的注释（可能是从10000行读取的数据）套接字触发缺失值注释）并且在datastep中有几百个数值变量隐藏在三层宏的深处，我正在尝试调试它。

[编辑] Jeff和Joe建议的note2err dsoption做了一些事情，但有点太苛刻了。它只是在生成缺失值消息时立即停止执行，而日志中没有任何更多有用的注释。现在日志是：

FOO=1 BAR=2 BAZ=2 syscc=0 syserr=0
ERROR: Operation performed on missing value at line 8 column 9.
ERROR: Termination due to Missing Value
NOTE: The SAS System stopped processing this step because of errors.
NOTE: DATA statement used (Total process time):

这实际上没有用（虽然如果我启用它会大大增加解决问题的需要）。设置option noerrorabend不会改变此行为。

Answer 1

如果我理解你的问题，你可以试试这个：

data _null_;
foo=1;
bar=2;
baz=foo*bar;
put foo= bar= baz= "syscc=&syscc syserr=&syserr";
foo=.;
bar=2;
baz=foo*bar; 
if missing(foo) or missing(bar) then put "operation on missing values occured!" _all_;
else put "operation is Ok!";
put foo= bar= baz= "syscc=&syscc syserr=&syserr";
foo=2;
bar=3;
baz=foo*bar;
put foo= bar= baz= "syscc=&syscc syserr=&syserr";
run;

在SAS datastep期间检测缺失值的操作

1 个答案: