## # A tibble: 240 × 3
## # Groups: asset [5]
## asset date returns
## <chr> <date> <dbl>
## 1 AMZN 2012-03-30 0.123
## 2 AMZN 2012-06-29 0.120
## 3 AMZN 2012-09-28 0.108
## 4 AMZN 2012-12-31 -0.0137
## 5 AMZN 2013-03-28 0.0604
## 6 AMZN 2013-06-28 0.0412
## 7 AMZN 2013-09-30 0.119
## 8 AMZN 2013-12-31 0.243
## 9 AMZN 2014-03-31 -0.170
## 10 AMZN 2014-06-30 -0.0351
## # ℹ 230 more rows
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