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// Advanvced Part 3 about really dumb investing strategy
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//=======================================================
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//two test portfolios
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val blchip_portfolio = List("GOOG", "AAPL", "MSFT", "IBM", "FB", "YHOO", "AMZN", "BIDU")
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val rstate_portfolio = List("PLD", "PSA", "AMT", "AIV", "AVB", "BXP", "CBG", "CCI",
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"DLR", "EQIX", "EQR", "ESS", "EXR", "FRT", "GGP", "HCP")
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// (1) The function below should obtain the first trading price
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// for a stock symbol by using the query
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//
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// http://ichart.yahoo.com/table.csv?s=<<symbol>>&a=0&b=1&c=<<year>>&d=1&e=1&f=<<year>>
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//
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// 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
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// for the stock symbols from a portfolio for the given
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// 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
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//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
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// a price in year n and a price in year n+1. The second function calculates
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// 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
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//val d = get_deltas(p)
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// (3) Write a function that given change factors, a starting balance and a year
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// calculates the yearly yield, i.e. new balanace, according to our dump investment
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// strategy. Another function calculates given the same data calculates the
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// compound yield up to a given year. Finally a function combines all
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// calculations by taking a portfolio, a range of years and a start balance
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// 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
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//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
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//investment(rstate_portfolio, 1978 to 2016, 100)
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//investment(blchip_portfolio, 1978 to 2016, 100)
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