A missing value indicates that a specific piece of information is missing. For example, the missing value (*) in the following table indicates that there is no length measurement for part 5.
Do not use a number (for example, -999) to represent missing values. Using a number to represent missing values will cause errors in your analyses. To change specific numbers to asterisks, use Recode to numeric.
If you type the word "Missing" or an asterisk into a text column, Minitab treats the value as a text value, rather than a missing value.