data_USA contains:
- OECD based Recession Indicators for 13 OECD countries from the Peak through the Trough from 1975:03 to 2019:05
- Yield Spread (10Years TB minus 3Months TB) for 13 OECD countries from 1975:03 to 2019:05
List of countries: Australia, Belgium, Canada, France, Germany, Italy, Japan, the Netherlands, New Zealand, Sweden, Switzerland, the United Kinkdom, the United States.