Add items without upsetting the existing datafile?

[barlab]

I began my data collection and have data for about 30 participants. I decided recently to add 2 items to one of my questionnaires.

When I entered them and ran the experiment, I noticed it failed to create the additional columns in the existing datafile. I was hoping it would create the columns and display the data as missing for the first 30 participants, and have the new data in for any participants run from that point.


I get an error message when I run the experiment and the data is misplaced (no columns are added on the excel document I viewed, and the data was shifted over by 2 cells). When I deleted the data and let medialab create a new file, the variables rows were added and it recorded the data properly and ran it with no errors.


I am wondering if there is a way around starting a new datafile and having to merge the old datafile (without the additional 2 items) with the new. Is there a way to have it record the new data in the existing datafile without causing problems?