# H. C. Chinwenyi

## Publications

##### 2 The Martingale Options Price Valuation for European Puts Using Stochastic Differential Equation Models

**Authors:**
H. C. Chinwenyi,
H. D. Ibrahim,
F. A. Ahmed

**Abstract:**

In modern financial mathematics, valuing derivatives such as options is often a tedious task. This is simply because their fair and correct prices in the future are often probabilistic. This paper examines three different Stochastic Differential Equation (SDE) models in finance; the Constant Elasticity of Variance (CEV) model, the Balck-Karasinski model, and the Heston model. The various Martingales option price valuation formulas for these three models were obtained using the replicating portfolio method. Also, the numerical solution of the derived Martingales options price valuation equations for the SDEs models was carried out using the Monte Carlo method which was implemented using MATLAB. Furthermore, results from the numerical examples using published data from the Nigeria Stock Exchange (NSE), all share index data show the effect of increase in the underlying asset value (stock price) on the value of the European Put Option for these models. From the results obtained, we see that an increase in the stock price yields a decrease in the value of the European put option price. Hence, this guides the option holder in making a quality decision by not exercising his right on the option.

**Keywords:**
monte carlo method,
martingales,
equivalent martingale measure,
European put option,
girsanov theorem,
option price valuation formula,
option price valuation

##### 1 A Study of Two Disease Models: With and Without Incubation Period

**Authors:**
H. C. Chinwenyi,
H. D. Ibrahim,
J. O. Adekunle

**Abstract:**

The incubation period is defined as the time from infection with a microorganism to development of symptoms. In this research, two disease models: one with incubation period and another without incubation period were studied. The study involves the use of a mathematical model with a single incubation period. The test for the existence and stability of the disease free and the endemic equilibrium states for both models were carried out. The fourth order Runge-Kutta method was used to solve both models numerically. Finally, a computer program in MATLAB was developed to run the numerical experiments. From the results, we are able to show that the endemic equilibrium state of the model with incubation period is locally asymptotically stable whereas the endemic equilibrium state of the model without incubation period is unstable under certain conditions on the given model parameters. It was also established that the disease free equilibrium states of the model with and without incubation period are locally asymptotically stable. Furthermore, results from numerical experiments using empirical data obtained from Nigeria Centre for Disease Control (NCDC) showed that the overall population of the infected people for the model with incubation period is higher than that without incubation period. We also established from the results obtained that as the transmission rate from susceptible to infected population increases, the peak values of the infected population for the model with incubation period decrease and are always less than those for the model without incubation period.

**Keywords:**
asymptotic stability,
incubation period,
Routh-Hurwitz criterion,
Runge Kutta method

## Abstracts

##### 2 The Martingale Options Price Valuation for European Puts Using Stochastic Differential Equation Models

**Authors:**
H. C. Chinwenyi,
H. D. Ibrahim,
F. A. Ahmed

**Abstract:**

**Keywords:**
monte carlo method,
martingales,
equivalent martingale measure,
European put option,
girsanov theorem,
option price valuation formula

##### 1 A Study of Two Disease Models: With and Without Incubation Period

**Authors:**
H. C. Chinwenyi,
H. D. Ibrahim,
J. O. Adekunle

**Abstract:**

**Keywords:**
Runge-Kutta Method,
asymptotic stability,
Hartman-Grobman stability criterion,
incubation period,
Routh-Hurwitz criterion