When a SAS data set cannot be found, specifies whether SAS issues
an error message.
||configuration file, SAS invocation, OPTIONS
statement, SAS System Options window
||Environment control: Error handling
|PROC OPTIONS GROUP=
specifies that SAS issue an error message
and stop processing if a reference is made to a SAS data set that does not
specifies that SAS ignore the error message
and continue processing if a reference is made to a SAS data set that does
not exist. The data set reference is treated as if _NULL_ had been specified.
DSNFERR is similar to the BYERR system option,
which issues an error message and stops processing if the SORT procedure attempts
to sort a _NULL_ data set.
DSNFERR is similar to the VNFERR system option,
which sets the error flag for a missing variable when a _NULL_ data set is
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