Tests Why tests are not perfect Kaiser explains why testing can't be perfect. Typically, the test itself can't be perfect; but also errors arise from outside the labs.
Covid-19 Bittersweet Kaiser Fung (Numbersense) describes the bitterweet moment when the data scientist discovers something.
Chapter 2 Eight unanswered questions about the coronavirus Kaiser Fung discusses eight unanswered questions about the coronavirus.
Algorithms If you are using Facebook Ads split testing (A/B testing), stop fooling yourself Kaiser Fung, founder of Principal Analytics Prep, and former director of Applied Analytics at Columbia University, explains why you can't run proper A/B tests on Facebook
Aggregation Dispute over analysis of school quality and home prices shows social science is hard Most of my friends with families fret over school quality when deciding
Algorithms Pre-processing data is not just about correcting errors Exploration of IMDB rating data, by Kaiser Fung, founder of Principal Analytics Prep