set sashelp.class(keep = _numeric_); *只读入数值型变量; run; drop语句的用法和keep一样,套着用就行,另外drop=选项的效率也高于drop语句。 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...
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...
Generally, keep statement cannot be used in the SAS Procedure with step-by-step calls once the keep= dataset option is declared. We need to follow up the same in both input and output datasets with the same variable or different variables for processing the entire application area. Keep keywo...
The subsetting IF statement loads all observations sequentially into the program data vector. If the statement finds a match and the statement is true, then the data is processed and is written to the output page buffer(If先读入pdv再进行筛选) 1.2:if可以从input的数据和sas数据集的数据中进行筛选...
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data want; merge have (where=(type='136') in=wanted) have; by account_number; if wanted=1; run; The WANTED dummy variable will be a 1 for all account numbers in have that include at least 1 instance of "136". That's due to the way a MERGE statement followed by a BY s...
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Although it's impossible to cover every detail of every Transact-SQL statement, command, feature or capability, this book provides you with a comprehensive look into SQL Server 2017. After reading each page of this book, you will be able implement a cloud- based or on-premises scalable, ...
This is a continuation of the previous article,Tipping Point Analysis in Multiple Imputation Using SAS. In the last post, we talked about the tipping point analysis in monotone imputation, but how to implement TPA in MCMC imputation since theMNARstatement can only support the shift adjustment in...