Date Editor

step Click the Variable View tab at the bottom of the Data Editor window.

step Select the Missing cell in the Age row and click the button to open the Missing Values dialog box.

In this dialog, you can specify up to three distinct missing values, or a range of values plus one additional discrete value.

step Select Discrete Missing Values.

step Type 999 as the missing value and leave the other two boxes blank.

step Click OK to implement your changes and return to the Data Editor.

Now that the missing data value has been added, a label can be applied to that value.

step Select the Values cell in the age row and click the button to open the Value Labels dialog box.

step Type 999 for the Value.

step Type No Response for the Value Label.

step Click Add to have this label added to your data file.

step Click OK to implement your changes and return to the Data Editor.