Egert ´ (2012) extends the time coverage of the Reinhart and Rogoff (2010b) sample back to
1790.7 He finds a small negative correlation between debt and growth and, using an endogenous
threshold model, some evidence of a non-linear relationship between debt and growth.
However, the estimated endogenous debt-to-GDP thresholds are generally much lower than
90 percent. In addition, Egert ´ (2012) mentions that the presence and the level of the thresholds
are not robust to small changes in country coverage, data frequency, and changes in the
assumptions on the minimum number of observations included in each regime.