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     1 val urban_prices1 = CW6c.get_prices(List("BIDU"), 2004 to 2008) | 
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     2 val urban_prices2 = CW6c.get_prices(List("GOOG", "AAPL"), 2010 to 2012) | 
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     3 val urban_prices3 = CW6c.get_prices(List("GOOG", "AAPL", "BIDU"), 2010 to 2012) | 
     1   | 
     4   | 
     2 val urban_prices = List(List(Some(311.349976), Some(27.505054)),   | 
     5 val urban_deltas1 = CW6c.get_deltas(urban_prices1)  | 
     3 			List(Some(300.222351), Some(42.357094)),   | 
     6 val urban_deltas2 = CW6c.get_deltas(urban_prices2)  | 
     4 			List(Some(330.555054), Some(52.852215)))  | 
     7 val urban_deltas3 = CW6c.get_deltas(urban_prices3)  | 
     5   | 
     8   | 
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     9 assert(CW6c.yearly_yield(urban_deltas1, 100, 0) == 100)  | 
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    10 assert(CW6c.yearly_yield(urban_deltas1, 100, 2) == 192)  | 
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    11 assert(CW6c.yearly_yield(urban_deltas2, 100, 0) == 125)  | 
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    12 assert(CW6c.yearly_yield(urban_deltas3, 100, 0) == 164)  | 
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    13 assert(CW6c.yearly_yield(urban_deltas3, 100, 1) == 119)  | 
     6   | 
    14   | 
     7 assert(CW6c.yearly_yield(CW6c.get_deltas(urban_prices), 100, 0) == 125)  | 
    15 val urban_inv1 = CW6c.investment(List("IBM", "BIDU"), 2004 to 2008, 100) | 
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    16 val urban_inv2 = CW6c.investment(List("GOOG", "AAPL", "BIDU"), 2010 to 2012, 100) | 
     8   | 
    17   | 
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    18 assert(urban_inv1 >= 295 && urban_inv1 <= 301)  | 
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    19 assert(urban_inv2 >= 194 && urban_inv2 <= 198)  | 
     9   | 
    20   | 
    10 val urban_blchip_portfolio = List("GOOG", "AAPL", "MSFT", "IBM", "FB", "AMZN", "BIDU") | 
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    11 val urban_rstate_portfolio = List("PLD", "PSA", "AMT", "AIV", "AVB", "BXP", "CCI",  | 
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    12                                   "DLR", "EQIX", "EQR", "ESS", "EXR", "FRT", "GGP", "HCP")   | 
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    13   | 
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    14 val urban_rstate_res = CW6c.investment(urban_rstate_portfolio, 1978 to 2017, 100)  | 
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    15 val urban_blchip_res = CW6c.investment(urban_blchip_portfolio, 1978 to 2017, 100)  | 
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    16   | 
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    17 // the rstate value is 30895 because of a faulty ESS.cvs file  | 
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    18   | 
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    19 assert(urban_rstate_res > 30885 && urban_rstate_res < 30905)  | 
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    20 assert(urban_blchip_res > 349587 && urban_blchip_res < 349607)  | 
         |