We closed our first survey and received a lot of filled out reports. Unfortunately also many reports where nothing is done. Looks like spam / robots. These mainly come from countries far away.
How can I clean up 'completely empty reports'? (were nothing is checked or filled out). I don't want to remove all unfinished reports, because we had a multi-page survey and people sometimes just stopped after page 2. We would like to preserve these 'half reports'. Hope you can help me.