Backtesting is not only a way to check signal accuracy, but also a tool to continually improvement. Data can be used for self adjustment as each stock have a individual behavior. Accuracy and return is not the same. A stock signal may provide low statistical accuracy, but the signals may prove high return in average. Sharp market dips or fundamental changes (earning reports, news updates etc), may force a short term reaction and disturb the signals (Signals may jump quickly from buy to sell, just to return to buy).
|2019-03-21 - 2019-03-21||SELL||0.00|
|2019-03-13 - 2019-03-21||BUY||-0.79|
|2019-03-11 - 2019-03-13||HOLD||2.41|
|2019-02-21 - 2019-03-11||SELL||21.81|
|2019-02-20 - 2019-02-21||HOLD||-2.86|