8/9/2019 · A Simple Introduction. According to the SAS Data Step Documentation, two automatic variables are created in a data step.The _ERROR_ variable and the _N_ variable. The _N_ variable is commonly used to keep track of the number of times the data step has iterated.
9/6/2020 · Using _N_ . The easiest and most straightforward way to rank your data is by sorting it and creating a new column with row numbers. The code below shows how to order your data set with PROC SORT and how to use _N_ to create a new column with row numbers.This method works fine only if your data isn’t grouped either contains duplicates.
The _N_ variable stores the row number of the row that is currently being processed. So, to select, for example, the first 5 rows of a table you can use the _N_ variable in combination with an IF-statement.
7/13/2020 · The first option to create a column with row numbers is using the automatic _N_ variable. SAS processes input data row by row and the automatic _N_variable stores the current row number. This variable is particularly useful for processing the first or last row. However, since _N_ is a variable you can also use it to add a column with row numbers.
Each sample value in the sorted data is assigned a sequence number which is kept in a special SAS variable named _n_ . The data values are then assigned to.
Understand the _N_ Automatic Variable in SAS – SASnrd, Assign serial numbers to observations in a data set in SAS, Understand the _N_ Automatic Variable in SAS – SASnrd, Understand the _N_ Automatic Variable in SAS – SASnrd
