« Come hear me talk about A/B Testing next Tuesday #optimizely | Main | Trifacta, an attempt to simplify the analyst's life »


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

Jordan Erickson

Great 538 article! I feel like I'm getting a behind-the-scenes view into how you did the analysis. If you are able, could you share with us what technique you used to determine the relative influences of variables/factors? (In the "What Do Health Inspectors Care About?" graph.)


Jordan: Glad you liked it. If you open the hidden "footnotes" section of the article, you will see some further description. In short, the chart is based on a classification tree (aka decision tree) algorithm, using those factors to "predict" the grade. I also tried using logistic regression, which gives a similar result... except that it's harder to summarize regression output in this case.

Jordan Erickson

Ah, didn't see the hidden footnotes. That helps. Now I just have to wait until I take my class on classification trees (in grad school)...


What does it mean "All rating schemes will be gamed to death"?

The comments to this entry are closed.


Link to Principal Analytics Prep

See our curriculum, instructors. Apply.
Kaiser Fung. Business analytics and data visualization expert. Author and Speaker.
Visit my website. Follow my Twitter. See my articles at Daily Beast, 538, HBR.

See my Youtube and Flickr.

Next Events

Jun: 5 NYPL Public Lecture on Analytics Careers, New York, NY

Past Events

Apr: 2 Data Visualization Seminar, Pasadena, CA

Mar: 30 ASA DataFest, New York, NY

See more here


Numbersense: Statistical Reasoning in Practice, Principal Analytics Prep

Applied Analytics Frameworks & Methods, Columbia

The Art of Data Visualization, NYU

Junk Charts Blog

Link to junkcharts

Graphics design by Amanda Lee


  • only in Big Data