I have a quarterly panel data of several countries. I have taken the data from Fred. Some countries' real gdp is in chained 2010 prices and some in other years (such as 2015 and 2018). How can I make it in the same basis?
And also these quarterly series are in their own national currencies. In order to have the common series, I have to change it to common currency. So I have taken data on PPP for GDP from the website of OECD. So my other question is that if my real gdp series are in chained 2010 prices, should I simply use 2010 exchange rate only for converting real gdp to another currency?