Tuesday, September 28, 2010

Some random plots related to the exam: average score by question, percentage of you choosing that question, and grade distributions for raw scores (5 questions) and with the proposed scaling (best 4 out of 5). Click on the picture for a larger version.

More details to come as I think about this a bit more ...


  1. How did this go from 12 people with a raw score 90+ to 4 people with a scaled score of 90+ I'm not certain I follow.

  2. Oops ... the x-axis labels on that bottom right plot are wrong. That is 4 people with grades between 99-100, and 12 with 90-99. I didn't end up adopting the best 4/5 scaling in the end, since it didn't really help a substantial percentage of the class.

    The scaling I adopted is here in which 14 people were between 90-100%. Everyone gained with this scaling.

  3. Ah, yes. I seem to have missed the fact that there are 3 columns labeled for grades in the 60s. Thank you for the clarification.

    Though (as you mentioned) this plot is not particularly applicable - it was a disturbing chart to read. In fact, it made me question the validity of life, the universe, and everything. Something like that anyway . . .