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ROC — Output from Calculating Stock Returns Producing Lower Numbers Than Actual

I tried this on stack exchange, but think it is a better question here. I am beginning user and I need help with an error / bad output I am getting when calculating returns (using ROC) on stock ...
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Is this R back-testing code correct

I am new to R back-testing and I have tried to make a back-testing strategy (a modified simple moving average crossover)in quantstrat and it failed. My skills in programming is average and the syntax ...