After completion of a large-scale phone survey using Kobo (KoboCollect on Tablets), we discovered that the dummy variable corresponding to one of the options of a ‘select many’ question is empty for all respondents. However, we know that this does not correspond to the data that was entered. Upon reviewing the form, we noted that two options of that question have the same code value (see screenshot below). Since we didn’t touch the code values when creating the form, it seems like Kobo created these identical codes itself.
Two questions arise:
- Is this a (potentially pretty consequential) bug? Also, should the form builder not assure that no two values can have the same code? Or is there a ever a scenario where two options should have the same code?
- In the data that we gathered, does this mean that electing either one of the options (or both), has resulted in a 1 in the dummy of the first of the two options (i.e. collapsing the answers of both into one)? From the data, this appears to have happened, as the dummy for the second option is empty.
Many thanks for your help!