October 2019
Intermediate to advanced
430 pages
19h 4m
English
Content preview from SAS Certified Professional Prep Guide
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Using a Variety of Advanced Functions
The LAG Function
A Brief Overview
Suppose you have the
Certadv.Stock6Mon data set that contains opening and closing stock
prices for the past six months for two different companies. You are
trying to determine which company has the bigger difference in the
daily opening price between consecutive days.
To start, consider what
you want the LAG function to return, as shown below.
Figure 14.1 Desired LAG Function Results for ABC Company, by Day
The LAG function enables you to compare the daily opening prices between consecutive days by retrieving the previous values of a column from the last time that ...
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