Before revision:  On the other hand, in periods that exhibit a sudden downward shift in GDP growth rate , including Google search data in the information set improves nowcasting accuracyeven when official macroeconomic information is available .
After revision:  On the other hand, in periods that exhibit a sudden downward shift in GDP growth rate of different countries during various economic periods. Our empirical findings support the idea that GSD tend to increase nowcasting accuracy, even after controlling for official variables, but that the gain differs between periods of recessions and of macroeconomic stability .