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To calculate the returns of AAPL & GOOG over the time period, you can use the Return.calculate function.
1stockReturns <- Return.calculate(adjustedPrices)
2head(stockReturns)
3## AAPL.Adjusted GOOG.Adjusted
4## 2017-01-03 NA NA
5## 2017-01-04 -0.001119178 0.0009667604
6## 2017-01-05 0.005085153 0.0090481583
7## 2017-01-06 0.011148442 0.0152766979
8## 2017-01-09 0.009159465 0.0006202319
9## 2017-01-10 0.001008411 -0.0023058897
10