Account value paths

Account value paths generated by the Monte Carlo simulation. The first 100 and 1000 paths out of 10000 are plotted.

The investment return on account value is modeled to follow the following geometric Brownian motion

$$\frac{\mathrm{\Delta }S}{S}=r\mathrm{\Delta }t+\sigma ϵ\sqrt{\mathrm{\Delta }t}$$

where $\mathrm{\Delta }S$ is the change in the account value $S$, in a small interval of time, $\mathrm{\Delta }t$, $r$ is the constant risk free rate, $\sigma$ is the volatility of the account value and $ϵ$ is a random number drawn from the standard normal distribution.

See also

• 1. Simple Stochastic Example notebook in the savings library

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import modelx as mx
import pandas as pd

model = mx.read_model("CashValue_ME_EX1")
proj = model.Projection
av = proj.av_pp_at

avs = list(av(t, 'BEF_FEE') for t in range(proj.max_proj_len()))
df = pd.DataFrame(avs)[1]

for scen_size in [100, 1000]:
    df[range(1, scen_size + 1)].plot.line(
        legend=False, grid=True, title="%s scenarios" % scen_size)