A Preliminary Analysis of EMA Period Lengths and Price Action in a Buy-Sell Model This blog introduced on March 26, 2026, an earlier version of the Buy on Proper Order and Sell on Dynamic Stop Loss Orders Buy-Sell model. Proper order was defined in that post by a relationship between a close price and two EMA values, such as close > ema_21 and ema_21 > ema_100. In this post, the model dynamically updates upper and lower boundary values based on price action to lock in a portion of accumulated gains or at least constrain the size of a loss associated with a trade. This post extends the March 26 post by updating the code for implementing the model, diving more deeply into how price action can change model performance, and testing the model over a broader range of tickers examined as well as over longer timeframes. The model examined in this post uses proper order relationships for close prices and exponential moving averages with different period lengths to discove...
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