listProduct

The listProduct function iterates over a list and evaluates a statement for each list iteration. listProduct returns the product of the evaluated statements.

set list: DRINKS
randomize: y
1. Wine
2. Beer
3. Coffee
4. Water

5. How many served drinks or bottles of each kind of beverage did you consume last week?
instructions: Your best guess is fine.
type: radio table
optsfrom: series[1..10]
rowsfrom: DRINKS

PRODUCT. The product of all answers of T5
type: coded number
cvalue: listProduct(DRINKS; $Q5R[id])

Details

• In its most basic form, listProduct accepts two inputs: a list name and a field reference constructed with the '[id]' placeholder. 
• Options can be filtered in or out of the list with inclusion/exclusion syntax.
• listProduct can be used with conditional statements such as show if and condition as well as with cvalue. 
• When multiple lists or conditions are used, the list name is prefixed to the [id] reference and separated by a colon, (e.g., [LISTNAME:id]). Prefixing clarifies list references and is necessary for the software to iterate across different lists.
• Though not explicitly tied to tables, table references are imagined to be the most common usage.