About a week and a half ago I reported on and expressed doubt about a new estimate from Nielsen Pubtrack which said that 6% fewer ebooks were sold in the US in 2014. At that time I had no evidence to prove that the Pubtrack numbers were off, but since then I have been digging into the background.
Today I can report that the Pubtrack estimate of 223 million ebooks sold in the US in 2014 was not just bad, it was completely erroneous.