On October 29th and December 18th, 2014, something very strange happened to the iTunes top apps chart. Like an earthquake shaking up the region, all app positions in the chart were massively rearranged, some booted off completely. These two extremely volatile days displayed rank changes that are orders of magnitude higher than the norm — lots of apps moving around, lots of uncertainly.
Highly interesting analysis and conclusion.
Apple, Apps and Algorithmic Glitches: A data analysis of iTunes’ top chart algorithm →