Sometimes variables (such as those in a Quanvert database) have base elements actually built into the variable. Built-in base elements sometimes contain filtering, which might, for example, exclude cases in a Don't know or Not answered category. When one of these bases appears in a variable, UNICOM Intelligence Reporter - Survey Tabulation does not add an autobase.

Note that when you select the variable elements that you want to include in an axis, you need to explicitly specify any built-in base elements if you want to include them. If you do not, UNICOM Intelligence Reporter - Survey Tabulation will automatically add an autobase to ensure hat the axis has a base element.

For example, the Museum Quanvert sample database has a base element built into all of the categorical variables. Suppose you create a table of remember by gender and you use the Edit Axis dialog (see Edit Axis dialog) to edit the two axes as follows:

In the table, the side axis (which is based on the remember variable) will include the Quanvert base element, because it is explicitly included in the axis expression, whereas the top axis (which is based on the gender variable) will not, because it is not included in the axis expression. Therefore, UNICOM Intelligence Reporter - Survey Tabulation will create an autobase element for the top axis but not for the side axis.

Both of the base elements in the table have the default label of "Base" and so the fact that one is an autobase and the other is the built-in Quanvert base is not immediately obvious from looking at the table.

When you create a new variable based on an existing variable that contains built-in special elements, the special elements are not copied to the new variable. For more information, see Creating variables.