Comparison of filtered responses against all responses

[sebthedev]

As suggested by @jlumbroso, it would be excellent if it were possible in the survey results page to view how the responses of a filtered set of respondents compares to the responses of the entire cohort.

For example, you could compare how the responses of students in one precept (selected using a demographic question filter) compare with all of the students in the course (the cohort).