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79 Cards in this Set

  • Front
  • Back
True or False: Placing an explicity OUTPUT statement in a DATA step overrides the implicit output, and SAS adds an observation to a data set only when an explicit OUTPUT statement is executed.
When a data set is ________, the values of an observation in the input data set become values of a variable in the output data set.
A ___ statement can be used within IF-THEN/ELSE statements to designate a group of statements to be executed, depending on whether the IF condition is true or false.
True or False: If you do not specify a SAS data set name or the reserved name _NULL_ in a DATA statement, then by default SAS automatically creates data sets with the names data1, data2, and so on in the work library.
You can output to multiple data sets by separating the data set names with a _______ after the output statement.
An alternate form of conditionally executing statements uses _______ groups.

______ <expression>;
WHEN ( )
WHEN ( )
OTHERWISE statement;
You can use the ______ and _____ data set options to write different variables to different data sets.
drop=, keep=
True or False: You can specify the DROP= or KEEP= data set options in the OUTPUT statement.
True or False: In the Data step, the DROP and KEEP statements apply only to output SAS data sets.
However, the DROP= and KEEP= data set options can apply to both input and output SAS data sets.
True or False: You can use the DROP= and KEEP= data set options along with the DROP and KEEP statements in PROC steps.
SAS applies data set options to input data sets before it

*__________ programming statements
*applies data set options to ________ data sets
evaluates, output
True or False: If a DROP or KEEP statement is used at the same time as a data set option, the data set option is applied first.
SAS processes a SAS data set from first obs to last obs by default.

The _______ and ______ data set options can be used to control which observations are processed.
firstobs=, obs=
True or False: You can use FIRSTOBS= and OBS= with input data sets only. You cannot use either data set option in the DATA statement.
The ________ data set option specifies the number of the last observation to process, NOT how many observations should be processed.
To guarantee that SAS processes all observations from a data set, you can use:

The ______ data set option specifies a starting point for processing an input data set.
_______ and _______ are often used together to define a range of observations to be processed.
firstobs=, obs=
True or False: The FIRSTOBS= system option for the individual data set overrides the FIRSTOBS= data set option.
How many observations will be read?

set prog2.military(firstobs=11 obs=25);

25, 15, 14, or 36 ?
True or False: The DROP= and KEEP= data set options cannot be used to exclude variables from processing during a PROC step.
True or False: DROP= and KEEP= do NOT affect the order in which the variables are processed.
You can use the DATA step to write:
* a custom _______
* data to an _______ file to be read by programming languages or software.
report, external
You can use the _________ procedure to read data from a SAS data set and write it to an external data source.
The ______ statement specifies at least one data set name that the SAS System uses to create an output data set.
Using the _______ keyword as the data set name causes SAS to execute the DATA step without writing observations to a data set.
The ______ statement can be used to specify the output destination for subsequent _____ statements in the DATA step.
file, put
True or False: You can use the FILE statement in conditional processing because it is executable.
The default file-specification for the FILE statement is _____.
A form of file-specification in the FILE statement that specifies the physical name of an external file, which is enclosed in quotes.
A form of file-specification in the FILE statement that specifies the file reference for an external file. You must have previously associated it with an external file in a FILENAME statement or function, or in an appropriate operating environment command.
A form of file-specification in the FILE statement that is a reserved file reference that directs the output from subsequent PUT statements.
A form of file-specification in the FILE statement that is a reserved file reference that directs the output from subsequent PUT statements to the same file as the output that is produced by SAS procedures.
True or False: You can only use one FILE statement to write multiple external files in a single DATA step.
True or False: You can use PRINT as your inital file-specification in the FILES statement to verify the contents of your output before creating an external file.
The _______ statement associates a SAS file reference with an external file or an output device.
In the FILENAME statement fileref specifies any SAS _____.
In the FILENAME statement, this specifies any SAS name.
In the FILENAME statement, this specifies type of device or the access method that is used if the fileref points to an input or output device or location that is not a physical file.
In the FILENAME statement, this specifies a physical name of an external file. The physical name is the name that is recognized by the operating environment.
In the FILENAME statement, these are used to specify details, such as file attributes and processing attributes, that are specific to your operating environment.
The _____ statement can write lines to the external file taht is specified in the most recently executed FILE statement.
You list the variables whose values you want written in the PUT statement wiht simple ______ _______.
list output
The PUT statement writes a ________ value, inserts a ______, and then writes the next value.
variable, blank
True or False: When a quoted character string is used to specify a string of text to write in a PUT statement, SAS automatically inserts a blank space.
In the PUT statement, the values of character variables are _____-aligned in the field; leading and trailing blanks are removed.
The null PUT statement used to output a blank line.
A ________ list output increases the versatility of the PUT statement because you can specify a SAS format to control how the variable values are written.
To use modified list output in the PUT statement, user the _____ format modifier between the variable name and format.
True or False: In Modified List Output, all leading and trailing blanks are deleted, and each value is followed by a single blank.
The _______ procedure enables you to browse external files with an interactive SAS session.
True or False: You can use the FSLIST procedure to browse SAS data sets.
PROC FSLIST ______=file specification <option(s)>;
The _____ automatic variable is created by every DATA step.
Each time that that the DATA step loops past the DATA statement, _N_ is incremented by __. Therefore, the data value of _N_ represents the number of times that the DATA step _______.
1, iterated
True or False: _N_ is added to the Program Data Vector (PDV) and is outputted.
Be careful in a PUT statement of __________ lines within a quoted string because it will produce unexpected results.
To add a single column of column headers before the rows of data to an external file, you can use ___ put statements or use if _N_ = ___ then put....
2, 1
The ______ option in the SET statement creates and names a temporary variable that acts as an end-of-file indicator.
The temporary variable created by the end= option in the SET statement is initialized to __. WHen the SET statement reads the last observation of the data set listed, the value of the variable is set to ___. The variable is not added to any new data set.
END= is an option in the _____ statement. It is not a data set option; it is not enclosed in _____.
set, parentheses
Use the _____ option in the FILE statement to create a file with an alternate delimiter (other than a blank).
For the DLM= option in the FILE statement, you can specify a _________ variable whose value contains your delimeter instead of a quoted string.
The ______ option in the FILE statement will add quotes. (deliminated separated data)
The _______ statement prevents SAS from re-iitializing the values of new variables at the top of the DATA step.
The RETAIN statement
* retains the value of the variable in the PDV across ______ of the DATA step.
* initializes the retained variable to ________ before the first execution of the DATA step if an inital value is not specified
* is a ________-time-only statement
iterations, missing, compile
The RETAIN statement has no effect on variables that are read with ______, ______, or UPDATE statements; values read from ____ data sets are automatically retained.
set, merge, sas
True or False: A variable referenced in the RETAIN statement appears in the output SAS data set only if it is not given an initial value or referenced elsewhere in the DATA step.
If you do not supply an initial value in the retain statement, all the values of your variable will be __________.
In SAS, the result of any mathematical operation on a missing value is ______.
If there are missing values in the data, you need to use a ________ in order to not get a missing value as the result of a mathematical operation.
When you create an accumulating total variable, an alternative to the RETAIN statement is the _____ statement.
True or False: The sum statement does not begin with a keyword.
The SUM statement:
* creates the variable on the ___ side of the plus sign if it does not already exist.
* initializes the variable to ____ before the first. iteration of the data step
* automatically ________ the variable.
* adds the variable of the ________ to the variable at ________
* ignores ______ values
left, zero, retains, expression, execution, missing
You can rearrange the observations into groups using the _______ procedure.
The SORT procedure:
* rearranges the observations in a DATA set
* can sort on ______ observations
* creates a SAS data set that is a _______ copy of the input data set
*replaces the input data set by ______
multiple, sorted, default
The ____ statement in the DATA step enables you to process your data into groups.
When a BY statement is used with a SET statement, the data must
* be sorted or grouped in order by the ____ variable(s), or
*have an _____ based on the ____ variable(s), or
*reside in a ______ table
by, index, by, DBMS
The _______ variable has a value of 1 for the first observation in a BY group; otherwise, it equals 0;
The ______ variable has a value of 1 for the last observation in a BY group; otherwise, it equals 0.
first., last.