SAS Retain Statement A Retain statement tells the SAS that it does not set the missing values assigned to the variables during each data step iteration. Instead, it will specify the variable names which sustain and retain the values of all the variables created in the Input or assignment statem...
1. Set的作用是:将数据集b中的记录逐条读入PDV中,在run语句的地方SAS会将pdv中的变量输出到数据集a中。 What SET Does Each time the SET statement is executed, SAS reads one observation into the program data vector. SET reads all variables and all observations from the input data sets unless you...
retain语句《不可执行的语句》retains values from the previous iteration of the DATA step 这个比较重要了,我先解释下sas的运行机制 sas的data步和run语句之间其实是一个循环,比如当使用set语句的时候,每次set一条观测,一直运行到run;再返回程序开头,继续set第二条观测值,一直将数据集的观测值读取完。 系统每读...
Without a RETAIN statement, SAS automatically sets variables that are assigned values by an INPUT or assignment statement to missing before each iteration of the DATA step. The RETAIN statement causes the values of all variables that are created with INPUT or assignment statements to be retained fr...
We can see that the value of Var3 in the second observation is assigned the value of 10. This is done using the RETAIN statement. From the above examples, we can clearly see that the SAS RETAIN statement is used to maintain the current value of a variable through multiple iterations of ...
Note that actually all variables that come from input dataset are already retained across data step iterations by SAS. This explains how the MERGE statement is able to implement a one to many merge. It also explains the way SAS keeps the values from the last observation in the shorter group...
Examples are provided todemonstrate the pitfalls one can experience when constructing a data step. Being cautious can avoid unexpected results. This paper uses a PUT _ALL_ statement to demonstrate how automatic retain variables can be retained.Huei-Ling Chen...
(If you assign different initial values to the same variable by naming it more than once in a RETAIN statement, SAS uses the last value.) You can also use RETAIN to assign an initial value other than the default value of 0 to a variable whose value is assigned by a sum statement....
“The biggest challenge facing higher education right now is just trying to wrangle all the information in a way that can actually be used for some really strong purposes,” Simon says. Since implementing SAS, efficiencies afforded by analytics have reduced costs at the university by more than ...
In your code you could even remove the Retain statement and the value would still be retained because SAS syntax ord+1 also implicitly leads to a retain. ...but: If the value wouldn't be retained then your counter wouldn't work at all as in the first case you would add +1 to a ...