# Calibration data selection - basic rules

Hey I found following rules for selecting data for calibration (source: "Kou Jump Diffusion Model: An Application to the Standard and Poor 500, Nasdaq 100 and Russell 2000 Index Options" by Wajih Abbasi1 , Petr Hájek , Diana Ismailova , Saira Yessimzhanova , Zouhaier Ben Khelifa , Kholnazar Amonov):

The final sample is obtained by applying five filters. First, all the options with an average price <50 cents were removed. Then the options with a spread which is the difference between the ask price and bid price divided by the mid-price of this option, where that spread represents more than 50% of the average call price are removed. These first two filters are meant to eliminate calls with a large spread in relation to bid-ask quotations reported by the database. We also removed options with a moneyness which deviates from the range (−10%, 10%). Indeed, the options that are deep out-of-the-money (OTM) or deep-in-the-money (ITM) are illiquid and have a low time value which substantially affects the predictive power of the estimated parameters value. Next, we eliminated options with <6 days or over 100 days to expiration. The former have almost zero time premiums while the latter are illiquid. Finally, all options that do not meet the noarbitrage assumption are eliminated. The majority of observations eliminated correspond to deep ITM calls.

I have some questions:

1. In the case of moneyness we need to have $$\frac{|\rm{strike}-S_0|}{S_0}\le0.1$$ right?
2. Is it okay that we remove all options with maturity longer than 100 days?
3. How to check which options do not meet the noarbitrage assumpion?

If $$S_t$$ is the underlier price at time $$t$$ and $$K$$ is the strike price, the percent moneyness is $$\frac{S_t-K}{K}$$ for a call and $$\frac{K-S_t}{K}$$ for a put. Otherwise, the percentages for puts and calls would be confusing. A put option on the stock of a bankrupt firm (so $$S_t=0$$) should be 100% in-the-money. If we divided by $$S_t$$, the percent moneyness would be infinite. Sinilarly, dividing by $$S_t$$ for a call option means that a deep-in-the-money option could never be 100% in-the-money even if the underlier were 100$$\times K$$.
How to check if an option does not meet no-arbitrage assumptions? First, if put-call parity does not hold, the put and call jointly fail the no-arbitrage assumption. Also, an option should be worth more than $$PV[\max(0,S_t-K)]$$ (for calls) or $$PV(\max(0,K-S_t)]$$ (for puts).
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