!M v
changes data values of
v
to missing values.
One of the operators
< <= <> >= >
may be inserted before v to modify the set of values changed to
missing.
If used after
!A
or
!I,
value
should refer to the encoded factor level rather than the value in the
data file.
Yield !M-9 # Missing values were entered as -9
Unset missing
!NA value
replaces missing data values with
value
and
!NA field
replaces missing data with values from the named
field.
Rate !NA 0 # Change missing values to zero
JuneWt !NA MayWt # Insert May wt if June wt is missing