Purchasing power parity by GDP

Purchasing power parity is from the University of Pennsylvania and is published in their Penn world table 6.3. The data mostly runs from 1950-2007. It is a measure of the effective differences in the price of goods between different economic areas, taking into account both exchange rates and inflation measurements. The Penn World Table calculates PPP in terms of GDP - PPP over GDP is the value of GDP in the national currency, divided by the value of GDP in (adjusted) US dollars.