Combining and Subsetting Data and SAS Arrays

1. BAS 150
Lesson 6:
Combining and Subsetting Data & SAS Arrays

2. • Create subsets of data
• Combine two or more data sets
• Utilize knowledge of SAS arrays
This Lesson’s Learning Objectives

3. Subsetting Data Sets

4. Subsetting Datasets

5. IF WHERE
Data step only Not used with RAW
data in data step
Reading in RAW
data
SAS datasets
Inside a PROC
statement
• Do the same thing
• Applied in different places
Rules for If & Where

6. Subsetting Datasets Cont.

7. Subsetting If

8. The Where Statement (1 of 2)

9. Operator Description Example Matches
IS
MISSING
Matches a missing
value
where gender is missing; A missing character value
IS NULL Equivalent to IS
MISSING
where age is null; A missing numeric value
BETWEEN
AND
An inclusive range where age between 20 and 40; All values between 20
and 40, including 20 and
40
CONTAINS Matches a substring where name contains 'MAC'; MACON, IMMACULATE
LIKE Matching with
wildcards
where name like 'R_N%'; RON, RONALD, RUN,
RUNNING
=* Phonetic matching where name =* 'NICK'; NICK, NACK, NIKKI
WHERE statement allows for additional operators
The Where Statement (2 of 2)

10. Combining Data Sets
(Joins & Merges)

11. Joins and Merges
 MERGE
 Joins
o One-to-one
o One-to-many
o Inner
o Excluding

12. One-to-One Joins (1 of 2)
Student_ID Quiz1
001 85
002 86
003 95
004 97
Student_ID Quiz2
001 96
002 88
003 85
004 94

13. One-to-One Joins (2 of 2)
Student_ID Quiz1 Quiz2
001 85 96
002 86 88
003 95 85
004 97 94

14. One-to-Many Joins (1 of 2)
Student_ID Gender
001 F
002 M
003 M
004 F
Student_ID Course_Title
001 Psychology 101
001 Philosophy 105
001 Math 212
002 Writing 222
002 Psychology 101
002 Spanish 301
… …

15. One-to-Many Joins (2 of 2)
Student_ID Gender Course_Title
001 F Psychology 101
001 F Philosophy 105
001 F Math 212
002 M Writing 222
002 M Psychology 101
002 M Spanish 301
… … …

16. MERGE Statement (1 of 3)
PersQuiz
SocQuiz
CogQuiz

17. MERGE Statement (2 of 3)

18. MERGE Statement (3 of 3)

19. Inner Joins (1 of 3)

20. Inner Joins (2 of 3)

21. Inner Joins (3 of 3)

22. Excluding Joins (1 of 2)

23. Excluding Joins (2 of 2)

24. SAS Arrays

25.  Collection of elements defined as a single group
 Allow us to write SAS statements referencing a
group of variables.
 Different than arrays in many other programming
languages.
SAS Array

26. Example

27. Example Array (1 of 2)

28. Example Array (2 of 2)

29. ARRAY array-name {subscript} <$> <length> <array-
elements> <(initial-value-list)>;
Array Statement
ARRAY array-name {subscript} array-elements;

30. More Examples of Arrays (1 of 2)

31. More Examples of Arrays (2 of 2)

32. * and Dim()

33. Creating Character Variables

34. Temporary Arrays (1 of 2)
 Do loop
 Exists only in data step
 Storing constant values

35. Temporary Arrays (2 of 2)

36. • Create subsets of data
• Combine two or more data sets
• Utilize knowledge of SAS arrays
Summary - Learning Objectives

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