The "Stack Overflow Representation" represents a ratio of the SO tag count (as a percent of total questions) divided by the TIOBE language index percent. Where a representation of 100% means that the SO tag count is aligned exactly with the TIOBE language index. An "over-representation", greater than 100%, might mean there's a greater number of questions on SO than we'd expect. An "under-representation", lower than 100%, might mean there's not as many questions on SO than we'd expect.
- Stack Overflow data taken from: StackOverflow.com/tags - data snapshot taken at 2:50am UTC, 6-Nov-2011. Total tag count was 2,254,639.
- TIOBE data taken from: latest available (October 2011) at www.tiobe.com/index.php/content/paperinfo/tpci/index.html