Economists Michael Ash and Robert Pollin each year ask graduate students in the applied-econometrics class they teach to replicate a published study.

WSJ: Spreadsheet Slips Not Economists' Only Problem

The new study by Robert Polin, Michael Ash and Thomas Herndon from University of Massachusetts, which was made public this week, found coding errors in spreadsheets used in the 2010 study, which they said meant that growth did not fall as fast as was claimed when debt passed 90% of a country's gross domestic product (GDP).

BBC: Doubt cast on research supporting austerity