Returns True if the value is empty. An empty string is one that contains no characters or just contains white spaces. An empty category list is one that contains no categories. A NULL value is deemed to be empty. Unless NULL, other data types are always deemed to be not empty.

If <value> is NULL, the return value is True.

The address variable is a text variable that stores respondents’ addresses. However, for some respondents the address has not been recorded and the variable stores an empty string. You could use the following to exclude those respondents: