When you are not making use of the contacts functionality, but still wish to include known metadata in the results, you can prefill hidden questions with this information by adding querystring parameters to the URL.
For each question in the survey a chart will automatically be created, and you can filter on any available chart in the reports.
You can prefill open text boxes, or closed questions, such as radio buttons questions, or checkbox questions. The open text box questions will result in a word cloud, the closed questions will result in bar, column or pie charts. The correct question type will depend on your specific analysis needs.