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Yes! thank you. I think this will work (but you should double-check). The denominator computes the sums-by-year for GDP, but only for the specified country so that you'll get just the GDP for the US in each year series y = 100*gdp/@sumsby(gdp, year, "@all if countrycode=""USA"&qu...

Following up on your suggestion. I would like to create an index relative to the date variables of an element in the panel. For example, a series GDP relative to the GDP of the United States for each year. Something like "series y = 100*gdp/@(gdp, countrycode="USA", 1950 2000)." ...