I was selected for the in depth household survey. They wanted to see all of my bills and bank statements. They wanted to know about my ATM withdrawals. I told them to f*&# off everytime they banged on my door. After more than a year they gave up. What a nightmare.
I think that was a scam to get your bank info.
The only survey I can find called "in depth household survey" was done on primitive tribes in New Guinea (Ok, and a few other third world countries).