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SMA Crossover Strategy

This is a simple SMA Crossover strategy that longs/shorts the SPY during strong trends, and liquidates during times of high market volatility, to withstand whipsaws (false signals). This liquidation function is especially helpful during 2011 and 2015, as it would have suffered from greater drawdowns otherwise. 

The 3 main components are as follows: 

1. When the 50 day SMA goes above the 200 day SMA, long the SPY.

2. When the 50 day SMA goes below the 200 day SMA, short the SPY. 

3. If the unrealized losses on any given day exceed $2000, liquidate. This was done by using:

if (profitloss <= -2000)

with profitloss being:

var profitloss = Portfolio[_symbol].UnrealizedProfit;

Please feel free to make any suggestions on how this can be improved. 

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Here is the backtest with $10,000 starting capital:

Notice how the amount for the liquidation component was changed from $2,000 to around $400 to reflect similar returns. 

If you changed the starting capital to 1 million, for example, then you would use 50k. 

if (profitloss <= -50000)
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