Stock A
Year | Return(%) | Deviation form expected return (D) | D^2 |
2008 | (5.00) | (8.83) | 77.97 |
2009 | 8.00 | 4.17 | 17.39 |
2010 | 8.00 | 4.17 | 17.39 |
2011 | (2.00) | (5.83) | 33.99 |
2012 | 2.00 | (1.83) | 3.35 |
2013 | 12.00 | 8.17 | 66.75 |
Expected Return = Sum of returns/No. of returns
= (-5+8+8-2+2+12)/6
= 23/6
= 3.83%
Variance = D^2/n-1
= (77.97+17.39+17.39+33.99+3.35+66.75)/5
= 216.83/5
= 43.366
Standard Deviation = Variance
= 43.366
= 6.59%
Stock B
Year | Return(%) | Deviation form expected return (D) | D^2 |
2008 | 19.00 | 8.17 | 66.75 |
2009 | 35.00 | 24.17 | 584.19 |
2010 | 7.00 | (3.83) | 14.67 |
2011 | (9.00) | (19.83) | 393.23 |
2012 | (14.00) | (24.83) | 616.53 |
2013 | 27.00 | 16.17 | 261.47 |
Expected Return = Sum of returns/No. of returns
= (19+35+7-9-14+27)/6
= 65/6
= 10.83%
Variance = D^2/n-1
= (66.75+584.19+14.67+393.23+616.53+261.47)/5
= 1936.83/5
= 387.366
Standard Deviation = Variance
= 387.366
= 19.68%
Portfolio Standard Deviation = [(WA*SDA)^2 + (WB*SDB)^2 + (2*WA*WB*SDA*SDB*CorAB)]
where
WA - Weight of stock A =.5
WB - Weight of stock B =.5
SDA - Standard Deviation of stock A = 6.59
SDB - Standard Deviation of stock B =19.68
CorAB - Correlation coefficient = .47
Portfolio Standard Deviation = [(.5*6.59)^2 + (.5*19.68)^2 + (2*.5*.5*6.59*19.68*.47)]
= [10.857025+96.8256+30.477432]
= 138.160057
= 11.75%
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