What are some trading strategies for stocks (just stocks, no derivatives) using freely available online data sources?
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There are two broad categories of trading strategies.
Elder's book outlines the major ones: http://www.amazon.com/Trading-Living-Psychology-Tactics-Management/dp/0471592242
And the depressing truth about most of these strategies is outlined by Aronson: http://www.amazon.com/Evidence-Based-Technical-Analysis-Scientific-Statistical/dp/0470008741/