Sas how does retain work

Since grade now equals 69 and lowgrade still equals 78 from the previous iteration, the value of the lowgrade variable is updated to Because grade equals lowgrade they are both 69 , SAS assigns the lowtype variable the same value as that of the gtype variable, that is, E4. Now, since last. As instructed by the code, SAS drops the gtype variable and renames the lowtype variable to gtype. So, here's what the lowest data set looks like after processing the first four observations:.

Here's where it should be clear that SAS has, by virtue of the code we've written, effectively taken four observations and collapsed them into one observation. There's just one more thing you might want to do to help you understand that second DATA step.

That is, click on the Inspect! Then, launch and run the SAS program, and review the output from the PRINT procedure to convince yourself that the lowest data set contains the lowest exam grade for each student. Also, note that the lowest data set contains one observation per student rather than six observations per student as in the original grades data set. Breadcrumb Home 17 Font size.

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Excepturi aliquam in iure, repellat, fugiat illum voluptate repellendus blanditiis veritatis ducimus ad ipsa quisquam, commodi vel necessitatibus, harum quos a dignissimos. Close Save changes. Help F1 or? For example, in the statement: RETAIN var1 0 var2 3 a b c 'XYZ' the variable var1 is assigned the value 0; the variable var2 is assigned the value 3, and the variables a , b , and c are all assigned the character value 'XYZ'. Example Inspect the Code. Lesson 17 Example 6 video.

Cumulative Score by Group Suppose you need to calculate cumulative sale by product categories. SAS : Cumulative Score z1 constitutes cumulative values of variable y by grouping variable x. Spread the Word! Share Share Tweet Subscribe. About Author: Deepanshu founded ListenData with a simple objective - Make analytics easy to understand and follow.

Unknown 3 November at Deepanshu Bhalla 15 January at Unknown 2 December at Unknown 30 December at Deepanshu Bhalla 30 December at Within a data step, SAS automatically create a couple of reserved variables.

These variables are added to the program data vector…. You can also use variable lists on the VAR statements of any analytic procedures. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Yes, add me to your mailing list. This site uses Akismet to reduce spam. Learn how your comment data is processed. Skip to content. Page Contents.