you've just described that the most common way of implementing holdout tasks in an ACBC investigation would be by using fixed CBC tasks or free format questions.
Currently, we are pretesting an ACBC with a free format slide as holdout task that is imitating an ACBC choice task using a HTML table with radio buttons.
By now, the HTML table really looks exactly the same as previous ACBC choice tasks (from the CBC tournament).
However, it seems like the data from this holdout task could not be collected/is not reported when analyzing the pretest data.
Therefore, I did some research on what might be the reason for the problem. I would guess that it is because radio buttons programmed in HTML ( <input type="radio" id="Stimulus1" name="Stimulus" value="Stimulus1" class="radiobutton">
) still need some codes/orders for reporting the related data.
As you have just described the option of using free format questions as holdout tasks in ACBC, I was wondering whether you have got some kind of "template" that could be used for free format holdout tasks in order to collect the related data properly?
You'd really be helping us a lot!