Lora D. Delwiche

2月 182020
 

In case you missed the news, there is a new edition of The Little SAS Book! Last fall, we completed the sixth edition of our book, and even though it is actually a few pages shorter than the fifth edition, we managed to add many more topics to the book. See if you can answer this question.

The answer is D – all of the above! We also added new sections on subsetting, summarizing, and creating macro variables using PROC SQL, new sections on the XLSX LIBNAME engine and ODS EXCEL, more on iterative DO statements, a new section on %DO, and more. For a summary of all the changes, see our blog post “The Little SAS Book 6.0: The best-selling SAS book gets even better."

Updating The Little SAS Book meant updating its companion book, Exercises and Projects for The Little SAS Book, as well. The exercises and projects book contains multiple choice and short answer questions as well as programming exercises that cover the same topics that are in The Little SAS Book. The exercises and projects book can be used in a classroom setting, or for anyone wanting to test their SAS knowledge and practice what they have learned.

Here are examples of the types of questions you might find in the exercises and projects book.

Multiple Choice

Short Answer

Programming Exercise

Solutions

In the book, we provide solutions for odd-numbered multiple choice and short answer questions and hints for the programming exercises.

  1. B
  2. Hint: New variables (columns) can be specified in the SELECT clause. Also, see our blog post “Expand your SAS Knowledge by Learning PROC SQL.”

While we don’t provide solutions for even-numbered questions, we can tell you that the iterative DO statement is covered in Section 3.12 of The Little SAS Book, Sixth Edition, “Using Iterative DO, DO WHILE, and DO UNTIL Statements.” The %DO statement is covered in Section 7.7, “Using %DO Loops in Macros.”

For more information about these books, explore the following links to the SAS website:

The Little SAS Book, Sixth Edition

Exercises and Projects for The Little SAS Book, Sixth Edition

Test your SAS skills with the newest edition of Exercises and Projects for The Little SAS Book was published on SAS Users.

1月 212020
 

One great thing about being a SAS programmer is that you never run out of new things to learn. SAS often gives us a variety of methods to produce the same result. One good example of this is the DATA step and PROC SQL, both of which manipulate data. The DATA step is extremely powerful and flexible, but PROC SQL has its advantages too. Until recently, my knowledge of PROC SQL was pretty limited. But for the sixth edition of The Little SAS Book, we decided to move the discussion of PROC SQL from an appendix (who reads appendices?) to the body of the book. This gave me an opportunity to learn more about PROC SQL.

When developing my programs, I often find myself needing to calculate the mean (or sum, or median, or whatever) of a variable, and then merge that result back into my SAS data set. That would generally involve at least a couple PROC steps and a DATA step, but using PROC SQL I can achieve the same result all in one step.

Example

Consider this example using the Cars data set in the SASHELP library. Among other things, the data set contains the 2004 MSRP for over 400 models of cars of various makes and car type. Suppose you want a data set which contains the make, model, type, and MSRP for the model, along with the median MSRP for all cars of the same make. In addition, you would like a variable that is the difference between the MSRP for that model, and the median MSRP for all models of the same make. Here is the PROC SQL code that will create a SAS data set, MedianMSRP, with the desired result:

*Create summary variable for median MSRP by Make;

PROC SQL;
   CREATE TABLE MedianMSRP AS
   SELECT Make, Model, Type, MSRP,
          MEDIAN(MSRP) AS MedMSRP,
          (MSRP - MEDIAN(MSRP)) AS MSRP_VS_Median
   FROM sashelp.cars
   GROUP BY Make;
QUIT;


 

The CREATE TABLE clause simply names the SAS data set to create, while the FROM clause names the SAS data set to read. The SELECT clause lists the variables to keep from the old data set (Make, Model, Type, and MSRP) along with specifications for the new summary variables. The new variable, MedMSRP, is the median of the old MSRP variable, while the new variable MSRP_VS_Median is the MSRP minus the median MSRP. The GROUP BY clause tells SAS to do the calculations within each value of the variable Make. If you leave off the GROUP BY clause, then the calculations would be done over the entire data set. When you run this code, you will get the following message in your SAS log telling you it is doing exactly what you wanted it to do:

NOTE: The query requires remerging summary statistics back with the original data.

The following PROC PRINT produces a report showing just the observations for two makes – Porsche and Jeep.

PROC PRINT DATA = MedianMSRP;
  TITLE '2004 Car Prices';
  WHERE Make IN ('Porsche','Jeep');
  FORMAT MedMSRP MSRP_VS_Median DOLLAR8.0;
RUN;

Results

Here are the results:

Now PROC SQL aficionados will tell you that if all you want is a report and you don’t need to create a SAS data set, then you can do it all in just the PROC SQL step. But that is the topic for another blog!

 

Expand Your SAS Knowledge by Learning PROC SQL was published on SAS Users.

1月 162018
 

If you are a SAS programmer, you may wonder why you should read this. After all isn’t SAS Enterprise Guide just for folks who don’t want to be bothered writing SAS code? SAS Enterprise Guide is just point, click, and get results, right? Well there is a lot more to [...]

The post SAS Enterprise Guide tools for programmers appeared first on SAS Learning Post.

7月 182017
 

Nowadays, whether you write SAS programs or use point-and-click methods to get results, you have choices for how you access SAS. Currently, when you open Base SAS most people get the traditional SAS windowing environment (aka Display Manager) as their interface. But it doesn’t have to be that way. If [...]

The post Organize your work with SAS® Enterprise Guide® Projects appeared first on SAS Learning Post.

9月 042015
 

I think everyone can agree that being able to debug programs is an important skill for SAS programmers. That’s why Susan Slaughter and I devoted a whole chapter to it in The Little SAS® Book. I don’t know about you, but I think figuring out what’s wrong with my program […]

The post What’s wrong with this SAS program? appeared first on SAS Learning Post.