SAS Programming Fundamentals

The SAS code reads 3 datalines but filters with 'if age le 30;' (age less than or equal to 30). John (age 38) and Mary (age 32) are excluded. Only Spielberg (age 28) satisfies the condition. The output dataset 'person' contains 1 observation.

During the compilation phase of a SAS DATA step that reads an external file, SAS creates the Input Buffer (to hold a record from the external file), the Program Data Vector (PDV), and the descriptor portion of the output dataset.

The single trailing at-sign (@) is a line hold specifier that keeps the input buffer in the current iteration, allowing the next INPUT statement in the same DATA step iteration to continue reading from the same record. It does NOT hold across iterations (that would be double trailing @@). Option A correctly describes this behavior.

The SUM function in SAS with the 'of' syntax sums a range of variables. SUM(of X1-X3) sums variables X1, X2, and X3. With X1=9, X2=4, X3=1, the sum is 9+4+1=14. The SUM function also handles missing values gracefully (treating them as 0). Option C is correct.

The PUT function converts numeric values to character values. It takes a numeric source and returns a character string representation, which is essential when you need to perform string operations on numbers or assign numbers to character variables. Option B correctly describes this.

PROC TRANSPOSE is used in SAS to transpose a dataset, turning observations into variables and variables into observations. This is the most efficient way to convert 1 observation with 30 variables into 30 observations.

To create a two-way cross-tabulation (crosstab) in PROC FREQ, use the TABLES statement with an asterisk between the two variables. The syntax 'TABLES country * sales' produces a crosstab with country as rows and sales as columns (showing the frequency of each combination). Option C uses correct syntax (TABLES with asterisk).

The ERROR automatic variable in SAS indicates whether any error occurred during DATA step execution. It is set to 1 when an error is detected and 0 when no errors occur. The line number where the error occurred does not affect its value - it's simply a binary flag.

PROC CONTENTS in SAS is specifically designed to show the descriptor portion of a SAS dataset, which includes metadata such as variable names, types, lengths, and creation dates.

In SAS, when a character variable is created without an explicit LENGTH statement and assigned from a function like SUBSTR, it inherits the length of the SOURCE string (11 characters for 'joshi anand'), not the length of the substring result (3 characters). The variable 'a' has length 11.

The LIBNAME statement uses 'smart quotes' (curly quotes) around the path, which SAS does not accept. SAS requires straight quotes. The correct syntax is Libname output_dir 'c:\mydocuments\output';. The rest of the code is valid.

In SAS, the VAR statement in PROC PRINT is used to specify the variables that you want to print and the order in which they should appear in the output.

In PROC SORT, the correct syntax for descending order is 'by descending variable-name'. The keyword DESCENDING must come BEFORE the variable name. Option B reverses this (incorrect), C uses ascending (wrong), and D is ascending by default.

The SYMPUT function is used to assign a DATA step value to a macro variable (CALL SYMPUT or %SYMPUT). SYMGET does the reverse (retrieves macro variable value). There is no ASSIGN function in SAS. SYSFUNC is used within macro to execute SAS functions.

In SAS macro language, macro variable assignments are treated as text strings unless evaluated by an evaluation function like %EVAL. Thus, %let x=a + c; simply assigns the literal text string '2 + 3' to x.

The WEEKDAY function returns 1 for Sunday, 2 for Monday, ..., 7 for Saturday. September 30, 2009 was a Wednesday, so WEEKDAY returns 4. The question gives the correct date and asks for the SAS WEEKDAY value.

SAS recognizes four token classes: Literals (numeric/character constants), Numbers (numeric values), Names (variable names, dataset names, keywords), and Special Characters (operators, delimiters). Option B correctly identifies these classes.

%SYSFUNC allows SAS functions to be executed within macro code (outside DATA steps). It bridges the macro facility and SAS function library. It does not execute SAS statements (that would be %SYSRPUT) nor is it for parameter passing.

PROC SQL can create indexes only on tables, NOT on views. Indexes in PROC SQL are classified as Simple (one column) or Composite (multiple columns). Therefore, the statement about views is False, making option B correct.