Developer Documentation Library > Data Model > Accessing the UNICOM Intelligence Data Model > Working with the Metadata Model > Derived variables > Special elements and helper elements in metadata > Special element types
 
Special element types
When you create metadata for special elements and their helper elements, ensure that you use the correct element type. For example, a mean element must have the element type mtAnalysisMean. This ensures that the element is handled correctly by the Table Object Model when you create tables containing the element.
The following sections show the element types and custom properties required for each type of special element, as well as those for any helper elements required by the special element:
See
Base
Unweighted Base
Mean
Standard deviation
Standard error and sample variance elements
Total
SubTotal
Text
Min and max elements
Sum
Median and percentile elements
Mode element
See also
Special elements and helper elements in metadata