_N_ Automatic Variable In SAS: The value for _N_ is initially set to 1. Each time the DATA step loops past the DATA statement, the variable _N_ increments by 1. The value of _N_ represents the number of times the DATA step has iterated. The following sample dataset will be used to demonstrate how to … Read more
The END= option used in the data step is very powerful to identify the last observation from the SAS dataset. The end= option to tell SAS to create a temporary numeric value whose value is used to detect the last observation. The following sample dataset will be used to show how to use end=last option … Read more
Selection of the first and last observations from the dataset could be a little tricky. You can use the first. and last. variable but it only works with the grouping of the data. It doesn’t work on the entire dataset. But the following options are available in SAS that helps you identify and extract last … Read more
In this article you’ll learn 8 different ways with examples on how to select the first N rows in SAS. Sometimes you may want to extract the first 5 observations or just a specific row, let’s say 5th observation, or you may want to extract observations within the specified range. Everything can be achieved using … Read more
In SAS you can import data from flat files, and also extract data from various other databases such as sql, oracle, db2, and so on. Sometimes you extract what is not necessary for you. The best example is blank rows coming from source. The empty rows are of no use hence it is important to … Read more
The FIRST. And LAST. functions can be used to identify first or last observations by group in the SAS dataset. First.Variable : It assigns value 1 to the first observation and 0 to the rest of the observations within the group in a SAS dataset. Last.Variable: It assigns value 1 to the last observation and … Read more
Here are three different ways you can delete rows from SAS dataset. Each method has different ways to write a code, specify conditions based on that SAS deletes the rows from a dataset. Method 1: Use DATA STEP To Delete Rows In SAS /* delete rows if id>= 10 */ data new_dataset; set original_dataset; if … Read more
One of the most common activities and issues in data management is to deal with the duplicate rows. Your well established ETL processes might be executing for weeks or months but at some point it may fail due to duplicates. It can either be generated due to fault at source end or wrong logic written … Read more
The both nodupkey and nodup (noduprecs) options can be used in the proc sort procedure. The function of these two options seems similar but it isn’t. In general they remove duplicate rows but in a bit different manner. It’s very important know the difference before you try to delete duplicate rows. With nodupkey option SAS … Read more
Formats are used to display variable values or written as output in SAS using the PROC FORMAT statement. The CNTLOUT= and CNTLIN=(options) are often used with the PROC FORMAT procedure in SAS when dealing with the user-defined formats. PROC FORMAT Syntax PROC FORMAT options; VALUE format_name specifications; INVALUE informat_name specifications; PICTURE format_name specifications; RUN; PROC … Read more