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arXiv 1102.0224q-fin.PR
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一类匹配看涨期权价格的极大熵密度

A Family of Maximum Entropy Densities Matching Call Option Prices

Cassio Neri, Lorenz Schneider

摘要:

我们研究了Buchen-Kelly密度在一类熵最大化密度族中的位置,这些密度族都与市场上观察到的给定到期日的欧式看涨期权价格相匹配.利用勒让德变换将熵函数和累积量母函数联系起来,证明了它是这个族中唯一的连续密度,也是熵最大的密度.我们提出了一个快速的寻根算法,可用于计算Buchen-Kelly密度,并给出了三个不同的差异,可用作收敛标准的上限。鉴于看涨期权价格,相同罢工的无仲裁数字价格只能在左和右看涨期权价差给出的上下边界内移动。随着看涨期权价格数量的增加,这些界限变得更紧,我们给出了两个例子,当我们使用中心看涨期权价差作为数字价格的代理时,密度在相对熵的意义上收敛到Buchen-Kelly密度。正如Breeden和Litzenberger所指出的,在极限情况下,一组连续的看涨期权价格完全决定了密度。

英文摘要:

We investigate the position of the Buchen-Kelly density in a family of entropy maximising densities which all match European call option prices for a given maturity observed in the market. Using the Legendre transform which links the entropy function and the cumulant generating function, we show that it is both the unique continuous density in this family and the one with the greatest entropy. We present a fast root-finding algorithm that can be used to calculate the Buchen-Kelly density, and give upper boundaries for three different discrepancies that can be used as convergence criteria. Given the call prices, arbitrage-free digital prices at the same strikes can only move within upper and lower boundaries given by left and right call spreads. As the number of call prices increases, these bounds become tighter, and we give two examples where the densities converge to the Buchen-Kelly density in the sense of relative entropy when we use centered call spreads as proxies for digital prices. As pointed out by Breeden and Litzenberger, in the limit a continuous set of call prices completely determines the density.

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