« The causation creep | Main | How averages get usurped by policymakers »


Feed You can follow this conversation by subscribing to the comment feed for this post.


I see the same with student evaluations on a distance only course I teach. Sometimes excellent students will comment. and then they may say course is too easy. Poor students will usually take issue with anything that they can. Average students usually don't comment.

As to your first example if 70% of students score C or above then predicting that all of the students score C or above will give 70% prediction accuracy.

business schools in Chicago

Students' evaluation should not be based on exams only. I think that the true evaluation is the one based on the every day participation of the students basis.

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Your comment could not be posted. Error type:
Your comment has been posted. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.


Post a comment

Your Information

(Name is required. Email address will not be displayed with the comment.)

Marketing and advertising analytics expert. Author and Speaker. Currently at Columbia. See my full bio.

Spring 2015 Courses (New York)

Jan 26: Business Analytics & Data Visualization (14 weeks) Info

Feb 23: Statistics for Management (10 weeks) Info

Mar 28: Careers in Business Analytics & Data Science (one-day seminar) Register

Apr 7: The Art of Data Visualization Workshop (6 weeks) Register

Next Events

Sep: 28 Data Visualization New York Meetup, New York, NY

Oct: 5 Andrew Gelman’s Statistical Communications class, Columbia University

Oct: 13 AQR ProSeminar, NYU Sociology

Oct: 22 Leading Business Change Through Analytics, Columbia Business School

Oct: 30 Ray Vella’s Designing Infographics class, NYU

Past Events

See here

Junk Charts Blog

Link to junkcharts

Graphics design by Amanda Lee


  • only in Big Data