Unemployment rates in OECD countries show nonlinearity and regime-switching patterns.
The study looked at unemployment rates in OECD countries to see if they show nonlinearity. They used a special model called PSTAR(1) to test for nonlinear patterns in the data. By analyzing data from 18 countries between 1956 and 1998, they found that unemployment rates in OECD countries do display nonlinearity, switching between different patterns over time. This means that the traditional idea of unemployment being a linear process may not always hold true.