Portfolio Diversification
Diversification is a way for investors to reduce investment risk. The asset values within a well-diversified portfolio do not move up and down in perfect synchrony. Find members of the Dow Jones Industrial Average whose returns tend to move in sync.
Build a correlation matrix between stocks.
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Build a graph with edges between stocks with correlation coefficient greater than 
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A largest group of stocks that tend to move in sync.
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Show the cumulative return plots.
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