誰能幫幫我...
我想要模擬股價的報酬率，
dS/S = μ*dT + σ*ε*√dT
where:
S = stock price ( given )
dS = change in stock price
μ = excepted return on the stock ( given )
σ = volatility of the stock price ( given )
ε = a standard normal distritution
dT = a time period equals to one week
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