Week 3

Question 1

Data step commands

Answer 1

Output
If var in (‘A’, ‘B’, ‘C’) then output;
Delete
If var = x then delete
Where
(Where = (var = x)); can be done on a proc step too

Question 2

IF-THEN-ELSE

Answer 2

IF-THEN-ELSE statements are linked. Else is conditional on the previous IF. If first condition is true then SAS skips the linked Else statement. SAS executes IF-THEN statements until it encounters its first true statement

Question 3

Logical operators

Answer 3

And- must meet all requirements
Or- must meet any requirement
Not
Use parentheses to frame options
Else if (cars= ‘Jetta’ and car= x)

Question 4

Length

Answer 4

Length var $ 10.;

Question 5

PROC CONTENTS

Answer 5

Gives detailed summary of dataset.
View a list of SAS datasets in an active library by using
PROC CONTENTS DATA= Perm.ALL NODS;

NODS is no detailed summary

Question 6

DO….END;

Answer 6

Used in data step with IF-THEN statements to execute multiple statements after the THEN DO. DO must be followed by END

IF year > 2000 then DO;
X=Y;
P=R;
END;