(a) Using data in the series MARKET, print and plot returns for the last 36 months in the data series, from January 1985 through December 1987....

(a) Using data in the series MARKET, print and plot returns for the last 36 months in the data series, from January 1985 through December 1987. Comment on any unusual observations. Next, using data from the DEC, MARKET and RKFREE files covering the entire 120 month time span, construct the risk premium measure (rDEC - rf) for DEC and the overall market risk premium (rm - rf). (Note: It is possible that for some months the risk premium of a particular company"s assets, or that for the market as a whole, is negative. Does this occur in your sample?