I should probably have qualified my earlier post, as the only data I have to draw on is my own anecdotal evidence.

Nevertheless, with the qualifications that I went to a private high school and am currently at an Ivy college:

Sample size: since freshman high school, 26 "teachers" and nine "professors."
Definitions: a teacher/professor is good-I if I was particularly interested in his/her course (and not just the subject), and good-R if I retained particularly more from that course. A teacher/professor is bad-I if I was particularly uninterested in his/her course (and not just the subject), and bad-R if I retained particularly little from that course.

Of my teachers, 2 good-I teachers and 0 good-R teachers, with two "maybes" - not particularly good but above-average. 3 teachers who were both bad-I and bad-R - all of these are extreme cases, in which I learned almost nothing and loathed the class.

Of my professors, 0 good-I and no data on good-R (I'm a sophomore), but already 2 bad-I and I highly suspect bad-R.