A stock has had returns of 9 percent, 10 percent, 22 percent, -12 percent, and 25 percent over the last five years.
1, What is the geometric return for the stock?
2. What is the standard deviation of this stock?
Average return=Total return/Total time period
=(9+10+22-12+25)/5=10.8%
Return | (Return-Average return)^2 |
9 | (9-10.8)^2=3.24 |
10 | (10-10.8)^2=0.64 |
22 | (22-10.8)^2=125.44 |
-12 | (-12-10.8)^2=519.84 |
25 | (25-10.8)^2=201.64 |
Total=850.8% |
Standard deviation=[Total (Return-Average return)^2/(Time period-1)]^(1/2)
=[850.8/(5-1)]^(1/2)
=[850.8/4]^(1/2)
=14.58%(Approx)
Geometric return=[(1+rate 1)(1+rate 2)(1+rate 3)(1+rate 4)(1+rate 5)]^(1/5)-1
=[(1+0.09)(1+0.1)(1+0.22)(1-0.12)(1+0.25)]^(1/5)-1
=9.98%(Approx).
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