You may have used the command MISSING VALUES in a file to declare a certain value(s)
as missing, for example:
MISSING VALUES V1 (8,9)
Here the values 8,9 will be considered missing in the data and will not be included
But, sometimes you want those values back. One way would be to close the file and
reload but that is cumbersome. The short way to do that is:
MISSING VALUES V1 ().
The above command will remove any previously declared values from missing category to the data category.