// Advanvced Part 3 about really dumb investing strategy+ −
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//two test portfolios+ −
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val blchip_portfolio = List("GOOG", "AAPL", "MSFT", "IBM", "FB", "YHOO", "AMZN", "BIDU")+ −
val rstate_portfolio = List("PLD", "PSA", "AMT", "AIV", "AVB", "BXP", "CBG", "CCI", + −
"DLR", "EQIX", "EQR", "ESS", "EXR", "FRT", "GGP", "HCP") + −
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// (1) The function below should obtain the first trading price+ −
// for a stock symbol by using the query+ −
//+ −
// http://ichart.yahoo.com/table.csv?s=<<symbol>>&a=0&b=1&c=<<year>>&d=1&e=1&f=<<year>> + −
// + −
// and extracting the first January Adjusted Close price in a year.+ −
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def get_first_price(symbol: String, year: Int): Option[Double] = ...+ −
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// Complete the function below that obtains all first prices+ −
// for the stock symbols from a portfolio for the given+ −
// range of years+ −
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def get_prices(portfolio: List[String], years: Range): List[List[Option[Double]]] = ...+ −
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// test case+ −
//val p = get_prices(List("GOOG", "AAPL"), 2010 to 2012)+ −
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// (2) The first function below calculates the change factor (delta) between+ −
// a price in year n and a price in year n+1. The second function calculates+ −
// all change factors for all prices (from a portfolio).+ −
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def get_delta(price_old: Option[Double], price_new: Option[Double]): Option[Double] = ...+ −
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def get_deltas(data: List[List[Option[Double]]]): List[List[Option[Double]]] = ...+ −
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// test case using the prices calculated above+ −
//val d = get_deltas(p)+ −
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// (3) Write a function that given change factors, a starting balance and a year+ −
// calculates the yearly yield, i.e. new balanace, according to our dump investment + −
// strategy. Another function calculates given the same data calculates the+ −
// compound yield up to a given year. Finally a function combines all + −
// calculations by taking a portfolio, a range of years and a start balance+ −
// as arguments.+ −
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def yearly_yield(data: List[List[Option[Double]]], balance: Long, year: Int): Long = ... + −
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//test case+ −
//yearly_yield(d, 100, 0)+ −
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def compound_yield(data: List[List[Option[Double]]], balance: Long, year: Int): Long = ... + −
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def investment(portfolio: List[String], years: Range, start_balance: Long): Long = ...+ −
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//test cases for the two portfolios given above+ −
//investment(rstate_portfolio, 1978 to 2016, 100)+ −
//investment(blchip_portfolio, 1978 to 2016, 100)+ −
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