If you have set up your survey as Anonymous – under Options while editing the survey – your Track Survey interface will display limited information to protect the identity of participants. 
You can track the following items for surveys marked as Anonymous:
- URL Expiry
- URL Status
- Invitation Date
- Delivery Status
Tracking options not available for Anonymous survey are:
- Detailed Log
- Participation Status
- Participation Date
- Participation IP Address
- Reminder Details
- Edit Pre-pop information