Bagaimana
kita menentukan suatu volatility dari trading beserta delta hedginya?
1.
Pertama-tama
kita harus mengidentifikasi the mispriced option (data diambil dari Bursa efek di Australia /Australian Stock Exchange, dalam hal ini Bank ternama di negara kangguru tersebut seperti halnya ANZ Bank)
Step-1: Download 1 year’s data from yahoo
finance
Step-2: Calculate SDEV (Historical
Volatility) and prepare for Relative Valuation(dari data yang kita dapat dari tabel ASX diatas). dengan ketentuan:
Implied
volatility > historical volatility, options are overvalued
Implied
volatility < historical volatility, options to be undervalued
Step-3: Select equity option ANZ -->>Implied Volatility:
31.20, Historical Volatility: 13.43, thus IV> HV, speculated that option
could be overvalued (dalam hal ini Implied Volatilitynya 31.20 dari tabel yang nilainya lebih besae dari historical volatilitynya 13.43 sehingga disimpulkan angka option yang kita pakai dalam kasus ini bernilai overvalued)
2. Langkah
ke 2:
Creating Delta neutral portfolio:
Step-1: Select options of ANZ based on strike
price dari tabel (the price=27.00) and expiration date (May 2018)
Step-2:
Short 10 calls and purchase required stock to get the delta neutral
portfolio
3. Langkah-3:
Holding
delta neutral portfolio for 2 weeks:
Week-1
Above
graph depicts the performance of the portfolio in week-1. Here, we have
observed that total value of the portfolio is going up gradually, but the
return of the portfolio has decreased dramatically, which is expected as it is
an overvalued option, as per our findings.
Week-2:
In
week-2, again we have observed the same as like in week-1. This portfolio value
and returns are also going in opposite directions, but this portfolio return
has started recovering the return after one days. This week portfolio
performance is better compare to week-1
4. Langkah-4
After end of first week we have
found the holding period return from the portfolio was 0.7% and after second
week it was .05% respectively. Yes, our portfolio has performed as per our expectations,
it was expected that the return will be lower if we hold this portfolio for
long.
Since,
the option has been identified as overvalued, it would not be a wise decision
to hold it for a long time; likewise, an undervalued option. In our point of
view an overpriced option is a good thing for selling, hence its better to
close the position early rather holding this option for three weeks
Written by: Saefudin
Professor reviewer: Dr Ivan Obaydin
Flinders University, Australia
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