Hi Dan ,
1. So whats the point of using Historical volatility if it doesnt sync with implied volatility?
2. Is implied volatility different for Calls and puts?
3. Is IV different for different strikes in CE's and PE's?
4. how do we calculate IV ?
5. How do we get to know during markets if volatility is increasing or decreasing and be careful while trading with options heavily without losing money ?
I remember back in January taking huge position in options and options value decreased a lot which was not much due to Time Value but due to decrease in Volatility .
Regards
Hi
A whole baggage of question you have my friend.
Ok, let me go through the questions number by number:
1.
Historical volatility against Implied volatility
Historical Volatility
Historical Volatility is a measure of price fluctuation over time. It uses historical price data to empirically measure the volatility of a market or instrument in the past.
In other words, it is also known as statistical volatility, which is also the standard deviation of day to day price change expressed as annual percentage. In terms of practical implementation in trading, Historical volatility is essentially used to know how a stock or future has fluctuated in the past and how much likely it is to do.
Implied Volatility
In stocks we have stock options as we in futures have future options. Ideally, a stock or future option should have volatility equal to that of the underlying. When the price of a stock or future option is calculated using the volatility of the underlying stock or future, we get the theoretical price of the option. But hardly do options have volatility equal to that of the underlying. The volatility implied by stock or future options can be higher or lower depending on how the market views the options.
The options volatility is therefore called implied volatility. When implied volatility of options is high we say options premium is high. The opposite is also true.
2.
Implied volatility in puts and calls
Have a look at the following screen shot. It was made in the past in the Euro. Check the 143 put and check the 143 call. The 143 put had an IV of 7.4% and the 143 call has an IV of 8.6%
As you see, the IV not necessary must be the same for the put and the call. Here again it depends on the market outlook of the people. If they are more bearish, the puts usually have a higher IV and vice versa with the calls.
3. IV on different strikes by call and put
The above screen shot also answer that. Different strike levels also have different IV. Check the 142 call and check the 142.5 put. The 142 call has an IV of 7% and the 142.5 put has an IV of 8.5%. That is because the risk on each of a strike level is different. Far out of the money can have huge IV as there is much more uncertainty compare to atm or itm options.
Here some more examples:
The same distance to the spot at 1525 but put and call have different IV:
http://i45.tinypic.com/8xjy50.png
Here an example with a far out of the money option. You see how much more IV they can have compare to an atm option:
http://i47.tinypic.com/11tlmol.png
4. How to calculate IV
Just do as shown in the following picture:
and here just an add for the fair value calculation for those which are not sure with it:
http://i48.tinypic.com/11u9lhu.png
5. What about during market hours. How do we know if the IV is rising or declining?
If your intra day option trading depends on that, you really need a platform or a software which gives you that information live as market moves on. Otherwise use your commons sense. Check the trend or tendency the market has. If the trend is up, the calls tend to have a higher IV and vice versa for the puts. If you are not sure about the trend or the tendency of the market, check the bid ask spreads or place some limit orders to see if you get filled. If you get easily filled it may is a sign that the market sentiment is changing or that IV has changed. Takes some experience to do such little testing games.
Puhh. That was work.
Good trading
DanPickUp
(One source you may are interested in:
http://ngureco.hubpages.com/hub/For...ion-Variance-and-Excel-Formula-for-Volatility)