We test the CAPM for this coursework; you will use one market index and a list of 10 companies’ weekly data and these companies should be from at least two sectors. Consider three sample periods: (1) Jan 2006 – Dec 2008, (2) Jan 2009 – Dec 2011 and (3) Jan 2012 – Dec 2014. The required data can be downloaded from Yahoo finance: http://uk.finance.yahoo.com/
Because βi=σim/(σm^2)=Covariance (market return(xi), individual stock return(yi))/variance of market return (xi)
In simple regression,
So the coefficient is actually βi=σim/(σm^2)
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