SAS Online Certification Training | Infile options in SAS
Infile
options are used to read the raw data which are located in external file. A raw
data file is an external text file whose records contain data values that are
organized in fields. Mostly SAS by default recognize the blank space as a
delimiter apart from this SAS unable to recognize and give the error. For that
purpose, DLM and DSD options are used for recognizing the delimiters other than
blank space. DLM and DSD write along with infile statements.
To
read the raw data file, the DATA step must provide the following instructions
to SAS:
the
location or name of the external text file
a
name for the new SAS data set
a
reference that identifies the external file
a
description of the data values to be read.
DLM
DLM=delimiter(s)
where delimiter(s) specifies
a delimiter for list input in either of the following forms:
‘list-of-delimiting-characters’ specifies
one or more characters (up to 200) to read as
delimiters.
The list of characters must be enclosed in quotation marks either in single or
double quote.
character-variable specifies
a character variable whose value becomes the delimiter, also we are writing so
many delimiters in the DLM option provided that the data observation containing
that delimiter. Suppose in the sas data sets are separated by comma and colon
so in the DLM both delimiters re required for reading the raw data.
Example- Infile cards dlm= “ ,
: “ ;
DSD
We
will using the DSD option in the INFILE statement to correctly read the raw
data. The DSD
option
changes how SAS treats delimiters when list input is used. Specifically, the
DSD option
sets
the default delimiter to a comma ,treats two consecutive delimiters as a
missing value also
Remove
quotation marks from the value.
When
the following program reads the raw data file, the DSD option sets the default
delimiter to a
comma
and treats the two consecutive delimiters as a missing value. Therefore, the
data is read
correctly.
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