Download stock price data from http://chart.yahoo.com/d/ for IBM (ticker symbol IBM) for the period December 1978 to December 1983 in a spreadsheet format. Use the last column of the data (titled Adj. Close) to compute monthly returns. Download index data for the S&P 500 from Economagic for the same period. Use regression to compute the beta for IBM (in Excel). Now use data for the period December 1993 to December 1998 to compute IBM's beta again. Then look up the beta number provided for IBM on Yahoo. Answer the following questions:
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