Browsing by Author "Yahya W.B."

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    On the Approximation of Pareto Distribution to Exponential Distribution Using the Gini Coefficient of Inequality
    (Professional Statisticians Society of Nigeria (PSSN), 2017) Yahya W.B.; Garba M. K.; Amidu L; Olorede, K. O.; Gatta, N. F.; Amusa L. B.
    Pareto proposed that income and wealth distribution obeys a universal power law valid for all times and countries, but subsequent studies have often disputed this position. Some even argued there is indeed no Pareto Law and that it should be entirely discarded in studies on distribution of wealth or resources. Many other probability distributions have been proposed such as log normal, exponential, gamma and two other forms by Pareto himself. Using data on imported goods from the National Bureau of Statistics as a case of distribution of wealth in Nigeria, we demonstrated that the distribution of money spent on importation in Nigeria also follow exponential distribution using the Gini coefficient which is a measure of inequality (degree of concentration) of a variable in the distribution of resources. Simulation studies were carried out at different sizes of items (or households) and varying values of the shape parameter and we compare how close the Gini coefficients of the exponential distribution approximate those obtained from the Pareto data as a credible alternative to Pareto distribution.
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    On the Strength of Agreement Between Students’ Initial and Final Academic Performances in Nigerian University System
    (Mathematical Association of Nigeria, 2015) 4. Banjoko A.W.,; Yahya W.B.; Abiodun H.S.; Adeleke M.O.; Afolayan R.B.; Garba M.K.; Olorede K.O.; Dauda K.A.
    This paper examines the strength of agreement between academic performances of students after their first and final years in the University. Academic performances of a total of 886 students that were admitted into various academic programs in the Faculty of Science, University of Ilorin, during the 2008/2009 academic session were followed-up to their year of graduation in 2012. Information on the grade point average (GPA) of students at the end of their first year in 2008, their final cumulative grade point average (CGPA) at the end of their studies in 2012 among others was collected. Results from this study generally showed a strong agreement between students initial and final academic performances in Nigeria University system (p < 0.001). This work will serve as useful counseling guide to prospective admission seekers into the Universities and all the stakeholders at enhancing students academic performances in the University system.