Optimal Prediction of Expected Value of Assets Under Fractal Scaling Exponent Using Seemingly Black-Scholes Parabolic Equation
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1 Mathematics Letters 2016; 2(2): doi: /j.ml Optimal Prediction of Expected alue of Assets Under Fractal Scaling Exponent Using Seemingly Black-Scholes Parabolic Equation Bright O. Osu 1, Joy Ijeoma Adindu-Dick 2 1 Department of Mathematics, College of Physical Applied Sciencs, Michael Okpara University of Agriculture, Umudike, Nigeria 2 Department of Mathematics, Faculty of Physical Biological Sciences, Imo State University, Owerri, Imo State, Nigeria address: megaobrai@hotmail.com (B. O. Osu), ji16adindudick@yahoo.com (J. I. Adindu-Dick) To cite this article: Bright O. Osu, Joy Ijeoma Adindu-Dick. Optimal Prediction of Expected alue of Assets Under Fractal Scaling Exponent Using Seemingly Black-Scholes Parabolic Equation. Mathematics Letters. ol. 2, No. 2, 2016, pp doi: /j.ml Received: July 7, 2016; Accepted: July 27, 2016; Published: October 11, 2016 Abstract: Assessing the stock price indices is the foundation of forecasting the market risk. In this paper, we derived a seemingly Black-Scholes parabolic equation. We then solved this equation under given conditions for the optimal prediction of the expected value of assets. Keywords: Fractal Scaling Exponent, Black-Scholes Equation, Assets Price Return, Optimal alue, Parabolic Equation 1. Introduction The problem associated rom behavior of stock exchange has been addressed extensively by many authors (see for example, Black Scholes, 1973; Black, et al., 1991). The concept of fractal world was proposed by Melbrot in 1980 s was based on scale-invariant statistics power law correlation (Melbrot, 1982). Fang et al., (1994) examined the relevance of fractal dynamics in major currency futures market. Fractal dynamics are forms of dynamics characterized by irregular cyclical fluctuations long term dependence. They estimated directly the fractal structure in currency futures prices based on a time series model of fractional processes. Based on the self-similarity property of fractal, Tokinaga Moriyasu, (1997) forecasted the time series by the fractal dimension which was obtained via the wavelet transform. Xiong, (2002) also applied the wavelet to measure the fractal dimension of Chinese stock market. Muzy, et al., (2000) estimated the statistical self-similarity exponents from the data made a quadratic fit for some low order moments. Several studies have examined the cyclic long-term dependence property of financial prices, including stock prices (Greene Fielitz, (1977); Aydogan Booth, (1988)). These studies used the classical rescaled range (R/S) analysis, first proposed by Hurst (1951) later refined by Melbrot Wallis, (1969) Wallis Matalas, (1970), among others. Using R/S analysis, Greene Fielitz, (1977) studied 200 daily stock returns of securities listed on the New York stock exchange they found significant long range dependence. A problem the classical R/S analysis is that the distribution of its regression-based test statistics is not well defined. As a result, Lo (1991) proposed the use of a modified R/S procedure improved robustness. The modified R/S procedure has been applied to study dynamic behavior of stock prices (Lo, 1991; Cheung, et al., 1994). Teverovsky et al., (1999) Willinger et al., (1999) identified a number of problems associated Lo s method. In particular, they showed that Lo s method has a strong preference for accepting the null hypothesis of no long range dependence. This happens even long-range dependent synthetic data. To account for the long-range dependence observed in financial data, Cutl et al., (1995) proposed to replace Brownian motion fractional Brownian motion as the building block of stochastic models for asset prices. An account of the historical development of these ideas can be traced from Cutl et al., (1995), Melbrot, (1997) Shiryaev, (1999). In this paper, we will derive a seemingly Black-Scholes parabolic equation. This equation is being solved under given conditions for the optimal prediction of the expected value of assets.
2 20 Bright O. Osu Joy Ijeoma Adindu-Dick: Optimal Prediction of Expected alue of Assets Under Fractal Scaling Exponent Using Seemingly Black-Scholes Parabolic Equation 2. The Model Consider a portfolio comprising h unit of assets in long position one unit of the option in short position. At time, T the value of the portfolio is h, (1) measured by the fractal index 0. After an elapse of time,, the value of the portfolio will change by the rate h + in view of the dividend received on h units held. By Ito s lemma this equals OR + h h+h + If we take h h= the uncertainty term disappears, thus the portfolio in this case is temporarily riskless. It should therefore grow in value by the riskless rate in force i.e. h+h Thus So =h! ! " + =! (2) =!. (3) Proposition 1: Let =0 (where is the market price of risk), then the solution of equation (3), which coincides the solution of =0 (4), =0,," is assumed constant, is given by (5a) =0, (5b),t = ) exp-./ λp67 8".(using equation (5a)) (6) 9+ :; 2< " = =0 (using equation (5b)). (7) Where is the investment output,! the discount rate, the variance of the stock market price. Proof: Let =0 (where is the market price of risk), then equation (3) becomes! + =!. (8) In order to remove the effect of the discount rate (!) from equation (8), we let!=0 set Hence equation (8) becomes =7.8" > (9a) =7.8" >. (9b) =0. (10) By the method of separation of variables, we assume a solution of the form Hence (11a) " =?@A. (11b) Substituting equations (11a) (11b) in equation (10) gives or = B CC =.DC B D =E A =.;D = (13a)? AA =E?. (13b) These are ordinary differential equations for? IG@=.; = (using equation (13a)) having solution = ) 7.JK2 L ". (14)? AA E?=0 (using equation (13b)) So that 9 =E 9=± E solution
3 Mathematics Letters 2016; 2(2): ? =7 O. (15) Hence, we obtain a special solution of the form But.; 2, = ) 7PQ (16) = =0.; 2 = ) 97 = " 7 O + 4 )E.S 7.; 2" = 7 O =9+ :; 2< " = (as in equation (7)). Solving for in the above equation gives the variance of the stock market price, \ ] are arbitrary constants. Proof: From equation (8), to equation (9b) we have equation (3) reduced to =0. (23) By the method of separation of variables, let the solution of equation (23) be Hence, " =?@ Equation (23) becomes?@ A =0. =?@ A. (24) By separation of variables equation (24) becomes.s =.O= :;", =T.:;" O= U <. From equation (25) we have BCC B = DC = D =E. (25)?AA? =E Equating this result to equation (9b) gives 7.8" W " =X 4E 9 Y S W " =T.:;" O= U < 7 8". (17) Equating equation (9a) to equation (16) gives,t = ) exp-./ λp67 8" (18) Proposition 2: Let =0 (where is the market price of risk), then the solution of equation (3) where is not a constant, coincides the solution of is given by =0. (19), =0," (20a) =0, (20b), = ) 7. = ; "Z8" [\ O +] O ^ (21) \9 O. +]9 O. =0 (using equation (20b)). (22) That is,? AA E?=0 _ B _ E?=0. (26) We then solve equation (26) using Euler s substitution method. Let =7 ", then Also IG=, _" _ =. (27) _B = _B _" = _B " B _ = T_B _" U= T_B _ B Equation (26) becomes _ = B _B T " _" _ B _B _" _", (28) _" U+_B " _ T U, U. (29) _" E?=0. (30) Let?=7 O" be the solution of equation (30), hence? A =97 O" ;? AA =9 7 O". Equation (30) becomes 9 7 O" 97 O" E 7 O" =0. Our auxiliary equation becomes Therefore 9 9 E =0. Where is the investment output,! the discount rate,
4 22 Bright O. Osu Joy Ijeoma Adindu-Dick: Optimal Prediction of Expected alue of Assets Under Fractal Scaling Exponent Using Seemingly Black-Scholes Parabolic Equation 9 = Z`Z:; (31) given as: =T de f Ug \7 O hi f K +]7 O hi f K, (39) 9 =.`Z:;. (32) From equation (27) we have IG=, but?=7 O", hence?= O. Our general solution becomes From equation (25) we have? =\ O +] O. (33) The solution of equation (34) becomes DC = D =E. = ) 7. = ; ". (35) But, from equations (33) (35) we have But, = ) 7. = ; " [\ O +] O ^. (36) =0 = ) 7. = ; " [\9 O. +]9 O.^ =\9 O. +]9 O. (as in equation (22)). Solving for in the above equation gives O.O = ]9 \9 =T.aO c2c U. bo Equating this result to equation (9b) gives 7.8" > " =X ]9 \9 Y > " =T.aO bo U O.O c2c 7 8". (37) Equating equation (9a) to equation (36) gives, = ) 7. = ; "Z8" [\ O +] O ^ (38) where \ ] are arbitrary constants; 9 9 are as defined in equations (31) (32). Proposition 3: For 0, the solution of equation (3) is where Proof We take Thus Hence 9 = j ±k: l8 j + 9 j = =± l8 k4+ j =. (40) m= ; ; =m g om (41) H H = E = 1 E m H H =H Hm.Hm H = 1 E m pm g. o+m gho Hm = ; pmgz o+m gz_q _r. = r )._r _ = 1 E m pp+1 m g o+pm gzho Hm +p+2 m gz_q _r +mgz_ q _r. In this case is not dependent on!. Substituting into the given differential equation we have!m g o= = Tpp+1 mg o+pm gz_q +p+2 mgz_q + _r _r m gz_ q _r U+T8; r UT. ; UpmgZ o+m gz_q. (42) _r Cancelling by m g collecting like terms we have Or Let 0= 2 mh o Hm + Ho Hm X p+1 m!m+ E m Y +o 2 pp+1!p+p E m!s 0= = m_ q _r + _q _r mt p+1!+ t ; mu+ We obtain ot = pp+1!p+1 +pt ; mu. p=0 = t m. (43) ;
5 Mathematics Letters 2016; 2(2): or m _ q _r +2m_q q8 _r = =0. (44) Let 9 9 be the roots of the equation, then Now, Then 9 +9 = 2 m 9 9 = 8 r =.. H o Hm 9 +9 Ho H 9 9 o=0 H Hm XHo Hm 9 oy=9 X Ho H 9 oy Ho Hm =u,u=xho H 9 oy Which gives u=7 O j solution 7.O j o =v7 O.O j H+] (45) (Where C B are arbitrary constants). Hence o =\7 O j +]7 O j (46) =m g om =T E U g - \7 O ; +]7 O ; 6 3. Conclusion =T de f Ug \7 O hi f K +]7 O hi f K. (47) The Models: equations (6), (21) (39) suggest the optimal prediction of the expected value of assets under fractal scaling exponent = de f which we obtained. We derived a seemingly Black Scholes parabolic equation its solution under given conditions for the prediction of assets values given the fractal exponent. Considering equation (6), we observed that when F = 0,E=0, the equation reduces to, = 7`8" ).This means that the expected value is being determined by the interest rate! time. If F=4,E=2x y, equation (6) reduces to, = ) 7PQ-.:e f " 2 ± 2x = y 67 8", this also means that the growth rate depends on price, time, interest rate. Considering equation (21), we observed that when our singularity strength, F=0, our fractal exponent, E=0, equation (21) becomes, = ) 7 8" [\ O +] O ^. If our singularity strength, F=4, our fractal exponent, E=2x y, equation (21) reduces to, = ) 7.= e z f "Z8" [\ O +] O ^. When x=1, we have, = ) 7.="Z8" [\ O +] O ^. This means that the expected value depends on stock price, interest rate, time. If 9 9 are positive, the stock price increases, hence the investment output increases. On the other h, if 9 9 are negative, the stock price decreases this leads to decrease in investment output. Considering equation (39), we also observed that when F=0, the equation becomes =0, this signifies no signal. If F=4, equation (39) becomes =T e f U g \7 O i f K +]7 O i f K, this implies that there is signal. We now further look at it when x=1 to have =T U g {\7 c K +]7 c K. Hence, if 9 FGH 9 are negative, the equation decays exponentially. On the other h, if 9 FGH 9 are positive, the equation grows exponentially. References [1] Aydogan, K., & Booth, G. G. (1988). Are there long cycles in common stock returns? Southern Economic Journal, 55, [2] Black, F., & Karasinski, P. (1991). Bond options pricing short rate lognormal. Financial Analysis Journal, 47 (4), [3] Black, F., & Scholes, M. (1973). The valuation of options corporate liabilities. Journal of Econometrics, 81, [4] Cheung, Y. W., Lai, K. S., & Lai, M. (1994). Are there long cycles in foreign stock returns? Journal of International Financial Markets, Institutions Money, 3 (1), [5] Cutl, N., Kopp, P., & Willinger, W. (1995). Stock price returns the Joseph effect: A fractal version of the Black- Scholes model. Progress in Probability, 36, [6] Fang, H., Lai, K., & Lai, M. (1994). Fractal structure in currency futures price dynamics. The Journal of Futures Markets, 14, [7] Greene, M. T., & Fielitz B. D. (1997). Long term dependence in common stock returns. Journal of Financial Economics, 5, [8] Hurst, H. E., (1951). Long term storage capacity of reservoir. Transactions of the American Society of Civil Engineers, 116, [9] Lo, A. W., (1991). Long term memory in stock market prices. Econometrica, 59, [10] Melbrot, B. B., (1982). The fractal geometry of nature. New York: Freeman. [11] Melbrot, B. B., (1997). Fractals scaling in finance:discontinuity, Concentration, Risk. New York: Springer-erlag. [12] Melbrot, B. B., & Wallis, J. R. (1969). Robustness of the rescaled range in the measurement of non-cyclic long-run statistical dependence. Water Resources Research, 5, [13] Muzy, J., Delour, J., & Bacry, E., (2000). Modelling fluctuations of financial time series: from cascade process to stochastic volatility Model. Euro. Phys. Journal B, 17,
6 24 Bright O. Osu Joy Ijeoma Adindu-Dick: Optimal Prediction of Expected alue of Assets Under Fractal Scaling Exponent Using Seemingly Black-Scholes Parabolic Equation [14] Shiryaev, A. N., (1999). Essentials of stochastic finance. Singapore: World Scientific. [15] Teverovsky,., Taqqu, M., & Willinger, W., (1999). A critical look at Lo s modified R/S statistic. Journal of statistical planning inference, 80, [16] Tokinaga, S., Moriyasu, H., Miyazaki, A, & Shimazu, N. (1997). Forecasting of time series fractal geometry by using scale transformations parameter estimations obtained by the wavelet transform. Electronics Communications in Japan, 80 (3), [17] Wallis, J. R., & Matalas, N. C., (1970). Small sample properties of H K-estimators of the Hurst coefficient. Water Resources Research, 6, [18] Willinger, W., Taqqu, M., & Teverovsky,., (1999). Stock market prices long-range dependence. Finance Stochastic, 3, [19] Xiong, Z., (2002). Estimating the fractal dimension of financial time Series by wavelets systems. Engineering- Theory Practice, 12,
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