Setting and Unsetting missing values
Context: Transforming the data
Set missing
!M v
changes data values of
v
to missing values.
One of the operators
%lt; <= <> >= >
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.
Rate !NA 0 # Change missing values to zero
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