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Ran into this 2012 question and thought it deserves some closure. The issue is resolved at least in the current In[]:= $Version Out[]= 12.1.1 for Mac OS X x86 (64-bit) (June 9, 2020) This code will return a single element TimeSeries: data=FinancialData["SPY","Volatility20Day",{{2012,10,11},{2012,10,11}}] with value In[]:= Values[data] ...


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This is nothing more than a fusion of the excellent answers by Rod and Sjoerd C. de Vries updated for MMa 12. Extract the prices from Wolfram's data service. portfolio = {"AAPL", "BA", "IBM", "BMW.DE", "DIS", "R", "PEP", "BRBY.L", "AXP", "BTI"}; assetCount = ...


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