Fractional shares and dodgy pie charts

TLDR: When fractional shares (revenue by product, market shares by company, or similar quantities) are ranked and grouped in buckets, any ratio of successive bucket means >0.5 is suspect. ————– Listening to this interview with John Hempton reminded me of his forensic scepticism about the following pie chart, taken from an investor presentation about the pharma company Valeant. John wrote (in 2014, when … Read more