How to calculate implied correlation via observed market price (Margrabe option)Can the Heston model be shown to reduce to the original Black Scholes model if appropriate parameters are chosen?Calculate volatility from call option priceImplied Correlation using market quotesImplied Vol vs. Calibrated VolInterpretation of CorrelationPricing of Black-Scholes with dividendHow do they calculate stocks implied volatility?Implied correlationEuropean option Vega with respect to expiry and implied volatilityIs American option price lower than European option price?

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How to calculate implied correlation via observed market price (Margrabe option)


Can the Heston model be shown to reduce to the original Black Scholes model if appropriate parameters are chosen?Calculate volatility from call option priceImplied Correlation using market quotesImplied Vol vs. Calibrated VolInterpretation of CorrelationPricing of Black-Scholes with dividendHow do they calculate stocks implied volatility?Implied correlationEuropean option Vega with respect to expiry and implied volatilityIs American option price lower than European option price?













3












$begingroup$


I can't seem to figure out how to do the following: compute the implied correlation $ρ_imp$ by using the observed market price $M_quote$ of a Margrabe option, and solving the non-linear equation shown below:



$$M_quote = e^−q_0Ttimes S_0(0)times N(d_+)−e^−q_1Ttimes S_1(0)times N(d_−)$$



where:



$$beginalign
& d_pm = fraclogfracS_0(0)S_1(0)+(q_1 − q_0 ±σ^2/2)TsigmasqrtT
\[4pt]
& sigma = sqrtsigma^2_0 + sigma^2_1 − 2rho_impsigma_0 sigma_1
endalign$$



Note that $d_− = d_+ − σsqrtT$.










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  • $begingroup$
    Bear in mind that what you're calculating is the margrabe option implied correlation, it's not necessarily the correct correlation to use for pricing other options, it's important to be aware of that.
    $endgroup$
    – will
    11 hours ago















3












$begingroup$


I can't seem to figure out how to do the following: compute the implied correlation $ρ_imp$ by using the observed market price $M_quote$ of a Margrabe option, and solving the non-linear equation shown below:



$$M_quote = e^−q_0Ttimes S_0(0)times N(d_+)−e^−q_1Ttimes S_1(0)times N(d_−)$$



where:



$$beginalign
& d_pm = fraclogfracS_0(0)S_1(0)+(q_1 − q_0 ±σ^2/2)TsigmasqrtT
\[4pt]
& sigma = sqrtsigma^2_0 + sigma^2_1 − 2rho_impsigma_0 sigma_1
endalign$$



Note that $d_− = d_+ − σsqrtT$.










share|improve this question









New contributor




Tara is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$











  • $begingroup$
    Bear in mind that what you're calculating is the margrabe option implied correlation, it's not necessarily the correct correlation to use for pricing other options, it's important to be aware of that.
    $endgroup$
    – will
    11 hours ago













3












3








3





$begingroup$


I can't seem to figure out how to do the following: compute the implied correlation $ρ_imp$ by using the observed market price $M_quote$ of a Margrabe option, and solving the non-linear equation shown below:



$$M_quote = e^−q_0Ttimes S_0(0)times N(d_+)−e^−q_1Ttimes S_1(0)times N(d_−)$$



where:



$$beginalign
& d_pm = fraclogfracS_0(0)S_1(0)+(q_1 − q_0 ±σ^2/2)TsigmasqrtT
\[4pt]
& sigma = sqrtsigma^2_0 + sigma^2_1 − 2rho_impsigma_0 sigma_1
endalign$$



Note that $d_− = d_+ − σsqrtT$.










share|improve this question









New contributor




Tara is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$




I can't seem to figure out how to do the following: compute the implied correlation $ρ_imp$ by using the observed market price $M_quote$ of a Margrabe option, and solving the non-linear equation shown below:



$$M_quote = e^−q_0Ttimes S_0(0)times N(d_+)−e^−q_1Ttimes S_1(0)times N(d_−)$$



where:



$$beginalign
& d_pm = fraclogfracS_0(0)S_1(0)+(q_1 − q_0 ±σ^2/2)TsigmasqrtT
\[4pt]
& sigma = sqrtsigma^2_0 + sigma^2_1 − 2rho_impsigma_0 sigma_1
endalign$$



Note that $d_− = d_+ − σsqrtT$.







black-scholes correlation european-options implied nonlinear






share|improve this question









New contributor




Tara is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




Tara is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 13 hours ago









Daneel Olivaw

3,0431629




3,0431629






New contributor




Tara is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked yesterday









TaraTara

164




164




New contributor




Tara is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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New contributor





Tara is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Tara is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











  • $begingroup$
    Bear in mind that what you're calculating is the margrabe option implied correlation, it's not necessarily the correct correlation to use for pricing other options, it's important to be aware of that.
    $endgroup$
    – will
    11 hours ago
















  • $begingroup$
    Bear in mind that what you're calculating is the margrabe option implied correlation, it's not necessarily the correct correlation to use for pricing other options, it's important to be aware of that.
    $endgroup$
    – will
    11 hours ago















$begingroup$
Bear in mind that what you're calculating is the margrabe option implied correlation, it's not necessarily the correct correlation to use for pricing other options, it's important to be aware of that.
$endgroup$
– will
11 hours ago




$begingroup$
Bear in mind that what you're calculating is the margrabe option implied correlation, it's not necessarily the correct correlation to use for pricing other options, it's important to be aware of that.
$endgroup$
– will
11 hours ago










2 Answers
2






active

oldest

votes


















2












$begingroup$

We know that $-1lerho_imple 1$ so perhaps the simplest approach is to try the possible values $rho_imp=-1,-0.9,-0.8,cdots,0.8,0.9,+1$, to calculate resulting $sigma$ values, d± values, and $M_quote$ values, then see which of these is closest to the observed market price. If desired you can then search a finer grid between two adjacent assumed correlations to pin it down more precisely. It is a manual but relatively simple method.






share|improve this answer









$endgroup$




















    1












    $begingroup$

    Let $rhotriangleqrho_imp$. Note that:
    $$fracpartial sigmapartial rho(rho)=-fracsigma_0sigma_1sigma(rho)<0$$
    Therefore $sigma$ is monotonic in implied correlation. In addition, the Margrabe pricing function $M(cdot)$ is also monotonic in volatility $sigma$ thus you can find an unique solution to the equation:
    $$tag1M_textquote=M(rho)$$
    where:
    $$M(rho)=e^−q_0TS_0(0)N(d_+)−e^−q_1TS_1(0)N(d_−)$$
    and $d_pm$ as defined in your question, with $M_textquote$ the observed market price. In practice, this can be restated as:
    $$tag2min_rholeft(M(rho)-M_textquoteright)^2$$
    because $(M(rho)-M_textquote)^2geq0$. This an optimization problem which can be solved through traditional techniques:



    • The solution suggested by @Alex C will give you a quick, approximate answer;

    • If you want arbitrary precision, you can use a simple Newton algorithm on either $(1)$ or $(2)$, this is quick to program in Excel VBA, or you can maybe even find an online tool that does it. This PDF explains the method for a vanilla call in a Black-Scholes framework to find the implied volatility, but the set-up is very similar. Another alternative is gradient descent but this would probably take longer to program and you have to do it on $(2)$;

    • You can also use Excel's Solver to find a solution to $(1)$ directly. I have tried with $S_0(0)=$101$, $S_1(0)=$113.5$, $sigma_0=45%$, $sigma_1=37%$, $T=1text year$ and $q_0=q_1=0$ and it has worked just fine.





    share|improve this answer











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      2 Answers
      2






      active

      oldest

      votes








      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      2












      $begingroup$

      We know that $-1lerho_imple 1$ so perhaps the simplest approach is to try the possible values $rho_imp=-1,-0.9,-0.8,cdots,0.8,0.9,+1$, to calculate resulting $sigma$ values, d± values, and $M_quote$ values, then see which of these is closest to the observed market price. If desired you can then search a finer grid between two adjacent assumed correlations to pin it down more precisely. It is a manual but relatively simple method.






      share|improve this answer









      $endgroup$

















        2












        $begingroup$

        We know that $-1lerho_imple 1$ so perhaps the simplest approach is to try the possible values $rho_imp=-1,-0.9,-0.8,cdots,0.8,0.9,+1$, to calculate resulting $sigma$ values, d± values, and $M_quote$ values, then see which of these is closest to the observed market price. If desired you can then search a finer grid between two adjacent assumed correlations to pin it down more precisely. It is a manual but relatively simple method.






        share|improve this answer









        $endgroup$















          2












          2








          2





          $begingroup$

          We know that $-1lerho_imple 1$ so perhaps the simplest approach is to try the possible values $rho_imp=-1,-0.9,-0.8,cdots,0.8,0.9,+1$, to calculate resulting $sigma$ values, d± values, and $M_quote$ values, then see which of these is closest to the observed market price. If desired you can then search a finer grid between two adjacent assumed correlations to pin it down more precisely. It is a manual but relatively simple method.






          share|improve this answer









          $endgroup$



          We know that $-1lerho_imple 1$ so perhaps the simplest approach is to try the possible values $rho_imp=-1,-0.9,-0.8,cdots,0.8,0.9,+1$, to calculate resulting $sigma$ values, d± values, and $M_quote$ values, then see which of these is closest to the observed market price. If desired you can then search a finer grid between two adjacent assumed correlations to pin it down more precisely. It is a manual but relatively simple method.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered yesterday









          Alex CAlex C

          6,63611123




          6,63611123





















              1












              $begingroup$

              Let $rhotriangleqrho_imp$. Note that:
              $$fracpartial sigmapartial rho(rho)=-fracsigma_0sigma_1sigma(rho)<0$$
              Therefore $sigma$ is monotonic in implied correlation. In addition, the Margrabe pricing function $M(cdot)$ is also monotonic in volatility $sigma$ thus you can find an unique solution to the equation:
              $$tag1M_textquote=M(rho)$$
              where:
              $$M(rho)=e^−q_0TS_0(0)N(d_+)−e^−q_1TS_1(0)N(d_−)$$
              and $d_pm$ as defined in your question, with $M_textquote$ the observed market price. In practice, this can be restated as:
              $$tag2min_rholeft(M(rho)-M_textquoteright)^2$$
              because $(M(rho)-M_textquote)^2geq0$. This an optimization problem which can be solved through traditional techniques:



              • The solution suggested by @Alex C will give you a quick, approximate answer;

              • If you want arbitrary precision, you can use a simple Newton algorithm on either $(1)$ or $(2)$, this is quick to program in Excel VBA, or you can maybe even find an online tool that does it. This PDF explains the method for a vanilla call in a Black-Scholes framework to find the implied volatility, but the set-up is very similar. Another alternative is gradient descent but this would probably take longer to program and you have to do it on $(2)$;

              • You can also use Excel's Solver to find a solution to $(1)$ directly. I have tried with $S_0(0)=$101$, $S_1(0)=$113.5$, $sigma_0=45%$, $sigma_1=37%$, $T=1text year$ and $q_0=q_1=0$ and it has worked just fine.





              share|improve this answer











              $endgroup$

















                1












                $begingroup$

                Let $rhotriangleqrho_imp$. Note that:
                $$fracpartial sigmapartial rho(rho)=-fracsigma_0sigma_1sigma(rho)<0$$
                Therefore $sigma$ is monotonic in implied correlation. In addition, the Margrabe pricing function $M(cdot)$ is also monotonic in volatility $sigma$ thus you can find an unique solution to the equation:
                $$tag1M_textquote=M(rho)$$
                where:
                $$M(rho)=e^−q_0TS_0(0)N(d_+)−e^−q_1TS_1(0)N(d_−)$$
                and $d_pm$ as defined in your question, with $M_textquote$ the observed market price. In practice, this can be restated as:
                $$tag2min_rholeft(M(rho)-M_textquoteright)^2$$
                because $(M(rho)-M_textquote)^2geq0$. This an optimization problem which can be solved through traditional techniques:



                • The solution suggested by @Alex C will give you a quick, approximate answer;

                • If you want arbitrary precision, you can use a simple Newton algorithm on either $(1)$ or $(2)$, this is quick to program in Excel VBA, or you can maybe even find an online tool that does it. This PDF explains the method for a vanilla call in a Black-Scholes framework to find the implied volatility, but the set-up is very similar. Another alternative is gradient descent but this would probably take longer to program and you have to do it on $(2)$;

                • You can also use Excel's Solver to find a solution to $(1)$ directly. I have tried with $S_0(0)=$101$, $S_1(0)=$113.5$, $sigma_0=45%$, $sigma_1=37%$, $T=1text year$ and $q_0=q_1=0$ and it has worked just fine.





                share|improve this answer











                $endgroup$















                  1












                  1








                  1





                  $begingroup$

                  Let $rhotriangleqrho_imp$. Note that:
                  $$fracpartial sigmapartial rho(rho)=-fracsigma_0sigma_1sigma(rho)<0$$
                  Therefore $sigma$ is monotonic in implied correlation. In addition, the Margrabe pricing function $M(cdot)$ is also monotonic in volatility $sigma$ thus you can find an unique solution to the equation:
                  $$tag1M_textquote=M(rho)$$
                  where:
                  $$M(rho)=e^−q_0TS_0(0)N(d_+)−e^−q_1TS_1(0)N(d_−)$$
                  and $d_pm$ as defined in your question, with $M_textquote$ the observed market price. In practice, this can be restated as:
                  $$tag2min_rholeft(M(rho)-M_textquoteright)^2$$
                  because $(M(rho)-M_textquote)^2geq0$. This an optimization problem which can be solved through traditional techniques:



                  • The solution suggested by @Alex C will give you a quick, approximate answer;

                  • If you want arbitrary precision, you can use a simple Newton algorithm on either $(1)$ or $(2)$, this is quick to program in Excel VBA, or you can maybe even find an online tool that does it. This PDF explains the method for a vanilla call in a Black-Scholes framework to find the implied volatility, but the set-up is very similar. Another alternative is gradient descent but this would probably take longer to program and you have to do it on $(2)$;

                  • You can also use Excel's Solver to find a solution to $(1)$ directly. I have tried with $S_0(0)=$101$, $S_1(0)=$113.5$, $sigma_0=45%$, $sigma_1=37%$, $T=1text year$ and $q_0=q_1=0$ and it has worked just fine.





                  share|improve this answer











                  $endgroup$



                  Let $rhotriangleqrho_imp$. Note that:
                  $$fracpartial sigmapartial rho(rho)=-fracsigma_0sigma_1sigma(rho)<0$$
                  Therefore $sigma$ is monotonic in implied correlation. In addition, the Margrabe pricing function $M(cdot)$ is also monotonic in volatility $sigma$ thus you can find an unique solution to the equation:
                  $$tag1M_textquote=M(rho)$$
                  where:
                  $$M(rho)=e^−q_0TS_0(0)N(d_+)−e^−q_1TS_1(0)N(d_−)$$
                  and $d_pm$ as defined in your question, with $M_textquote$ the observed market price. In practice, this can be restated as:
                  $$tag2min_rholeft(M(rho)-M_textquoteright)^2$$
                  because $(M(rho)-M_textquote)^2geq0$. This an optimization problem which can be solved through traditional techniques:



                  • The solution suggested by @Alex C will give you a quick, approximate answer;

                  • If you want arbitrary precision, you can use a simple Newton algorithm on either $(1)$ or $(2)$, this is quick to program in Excel VBA, or you can maybe even find an online tool that does it. This PDF explains the method for a vanilla call in a Black-Scholes framework to find the implied volatility, but the set-up is very similar. Another alternative is gradient descent but this would probably take longer to program and you have to do it on $(2)$;

                  • You can also use Excel's Solver to find a solution to $(1)$ directly. I have tried with $S_0(0)=$101$, $S_1(0)=$113.5$, $sigma_0=45%$, $sigma_1=37%$, $T=1text year$ and $q_0=q_1=0$ and it has worked just fine.






                  share|improve this answer














                  share|improve this answer



                  share|improve this answer








                  edited 13 hours ago

























                  answered 13 hours ago









                  Daneel OlivawDaneel Olivaw

                  3,0431629




                  3,0431629




















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