For economic and social researchers, data can come in handy to either reinforce your own views or to cast doubt on the views of those that disagree with you. In the last couple of months, I have been fortunate enough to have access to some mighty fine spreadsheets. One of my favourites is the ATO two per cent sample file of personal income tax and superannuation data items. Two per cent does not sound very much but there are a lot of people lodging a tax return. A spreadsheet of 285,000 rows and lots of columns is an impressive thing,...