| 82 |      1 | 
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|  |      2 | val test_data = List(List(Some(71.539941), None), List(Some(76.974614), None), 
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|  |      3 |                      List(Some(65.226685), Some(6.35)), List(Some(78.354649), Some(12.241)), 
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|  |      4 |                      List(Some(85.517645), Some(38.188)))
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|  |      5 | 
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|  |      6 | val test_deltas = List(List(Some(0.07596697626574789), None), 
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|  |      7 |                        List(Some(-0.152620823795232), None), 
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|  |      8 |                        List(Some(0.20126676681483952), Some(0.9277165354330709)), 
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|  |      9 |                        List(Some(0.09141762603007778), Some(2.119679764725104)))
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|  |     10 | 
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| 169 |     11 | assert((yearly_yield(test_deltas, 100, 0) - 107).abs <= 2)
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|  |     12 | assert((yearly_yield(test_deltas, 100, 1) - 85).abs <= 2)
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|  |     13 | assert((yearly_yield(test_deltas, 100, 2) - 156).abs <= 2)
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|  |     14 | assert((yearly_yield(test_deltas, 100, 3) - 210).abs <= 2)
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|  |     15 | assert((investment(List("IBM", "BIDU"), 2004 to 2008, 100) - 298).abs <= 10)
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| 82 |     16 | 
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