The DET checks for missing values as you enter observations. An item is considered to be invalid when any of the following applies:
Items can also be questionable or extremely questionable. This depends on the prices of the observations for an item. An out of context price might be a typing mistake or a real price which must be included in the dataset.
To help the user identify such items the DET offers multiple options for their discovery. These include:
To gain access to this function you must run the DET in full mode.
See also: