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Use a RETAIN statement to specify initial values for individual variables, a list of variables, or members of an array. If a value appears in a RETAIN statement, variables that appear before it in the list are set to that value initially.
What is the retain order in SAS?
Nearly every method of arranging variables in a dataset relies on the fact that SAS orders columns based on the order in which the variables are declared or defined. As such, declarative statements such as RETAIN will serve to order columns in a dataset when they are placed prior to the SET statement.
What is the syntax of retain?
The syntax of the RETAIN statement is straightforward, the word retain plus the name of the variable you want to create. Note that a RETAIN statement variable will have a default value set to missing. This is why we are initializing the variable with a zero to complete the summation as we intended.
What does the retain do?
What does the retina do? The retina captures the light that enters your eye and helps translate it into the images you see. Light passes through the lens at the front of your eye and hits the retina. Photoreceptors cells inside your retina that react to light change light energy into an electrical signal.
What is the difference between keep and retain data step?
The RETAIN statement causes SAS to hold the value of a variable from one iteration of the DATA step to the next iteration. The KEEP statement does not affect the value of variables but specifies only which variables to include in any output data sets.
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The RETAIN statement permits single values of variables to be carried forward from one iteration of the DATA step to the immediately following iteration, whilst the other approaches have the potential to allow values to be transferred from one iteration to any subsequent one.
What is the difference between lag and retain in SAS?
The intended audience is beginner to intermediate SAS users. The RETAIN statement holds the value of a variable across data step iterations and the LAG function returns the value of the variable from the previous observation.
What does the retain statement do in SAS?
We use the RETAIN statement when we want SAS to preserve a variables value from the previous iteration of the DATA step. As a result, we could carry over the value of variables from one observation to another to perform calculations or compare values across observations.
Related links
17.2 - The RETAIN Statement | STAT 481
When SAS reads the DATA statement at the beginning of each iteration of the DATA step, SAS places missing values in the program data vector for variables
Base SAS 9 Programming: Inputs and Outputs from Skillsoft | NICCS
use the RETAIN statement to create an accumulating variable in SAS; use the SUM statement to create an accumulating variable in SAS; summarize data by groups
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