Consider the characteristics of the following three stocks:
Expected Return | Standard Deviation | |||||
Thumb Devices | 16 | % | 29 | % | ||
Air Comfort | 14 | 25 | ||||
Sport Garb | 14 | 22 | ||||
The correlation between Thumb Devices and Air Comfort is −0.17. The correlation between Thumb Devices and Sport Garb is −0.22. The correlation between Air Comfort and Sport Garb is 0.83.
Select only two stocks for your portfolio based on low correlation and low risk.
Sport Garb and Thumb Devices
Air Comfort and Sport Garb
Air Comfort and Thumb Devices
The two stock choosen should be those which will have lowest correlation so that the portfolio risk (SD) is minimised
Since, correlation between Thumb Devices and Sport Garb is −0.22, these should be choosen.
(Detailed Analysis, if required is shown below)
The weight of these two stock in the portfolio shall be decided by using the following formula
Wa = SDb / (SDa+SDb) and weight of Wb = 1 - Wa.
Portfolio Return=Wa*Ra+Wb*Rb
Portfolio SD =
where Wa = Weight of stock a ; Wb = Weight of Stock B; SDa = Standard deviation of stock A; SDb = Standard deviation of stock B; r = Correlation Coefficient between a & b
Calculations are shown below:
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