No value options let you to determine how Analysis Workspace handles situations where an event in a dataset contains a metric but the dimension did not contain a value. You can choose the name of this dimension item, hide it entirely, or even treat it as an actual value.
|If shown, call “No value”||A text field that lets you rename the No value dimension item to something else.|
|Don’t show No value by default||Does not show this value in reporting. Metric occurrences not tied to this dimension are not visible in the report.|
|Show No value by default||Shows this value in reporting.|
|Treat No value as a value||Replaces blank values in the data with the text that you specified under If shown, call “No value”. For example, if you had Mobile device types as the dimension, you could rename the No value item to “Desktop”. When you change this field to a custom value, the custom value is treated as a legitimate string value. Therefore, if you enter the value “Red” into this field, any instances of the string “Red” appearing in the data itself rolls under the same line item that you have specified.|
Here is a related blog post about handling “no value” in CJA.