as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
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historical data files for nyse/nasdaq daily open/close price data?
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another possibly more flexible option is yahoo finance here is an example for the dow.. http://finance.yahoo.com/q/hp?s=%5edji&a=9&b=1&c=1928&d=3&e=10&f=2012&g=d&z=66&y=0 some of the individual stocks you can dl directly to a spreadsheet (not sure why this isn't offer for indexs but copy and paste should work). http://finance.yahoo.com/q/hp?s=actc.ob+historical+prices
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