Web Reference: Mar 9, 2026 · When the LAG function is compiled, SAS allocates memory in a queue to hold the values of the variable that is listed in the LAG function. For example, if the variable in function LAG100 (x) is numeric with a length of 8 bytes, then the memory that is needed is 8 times 100, or 800 bytes. Jan 11, 2022 · This tutorial explains how to use the LAG function in SAS, including several examples. Understanding how the LAG function operates is crucial, as it fundamentally relies on a queue mechanism. When SAS processes data sequentially, the LAG function holds the value of the specified variable in a queue and releases the value from the previous iteration when called.
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