1. Comparison of Stochastic Soybean Yield Response Functions to Phosphorus Fertilizer

    Mohammad Masjkur

    Abstract: The random parameter approach of fertilizer response model was known better than fixed parameter version for determining optimum doses of fertilizer recommendation. However, the selection of functional forms suitable for certain cropping condition was also critical. The purpose of this study was to know the best model of stochastic soybean yield response function to phosphorus fertilizer. The research was conducted based on multilocation experimental data of soybean yield response to phosphorus fertilizer.  The fixed parameter models (M1) of Linear plateau, Spillman-Mitscherlich, Quadratic and Logistic were compared with the random parameter models containing either 1 (M2) or 2 random effects (M3) using -2 log-likelihood, Akaike information criterion, and Bayesian information criterion. Results showed that the AIC values of M1 fixed parameter models sequentially were Linear plateau < Spillmann-Mitscherlich = Logistic < Quadratic. Meanwhile, the AIC values of M2 random parameter models sequentially were Linear plateau < Logistic < Spillmann-Mitscherlich < Quadratic. The AIC values of M3 random parameter models sequentially were Spillmann-Mitscherlich < Logistic < Linear plateau. The best model for soybean yield response function to phosphorus fertilizer was the stochastic Spillmann-Mitscherlich model with location intercept and the increase in yield by applying fertilizer random effects.

    Keywords: response functions, fixed effect, random effects, multilocation trials, soybean.

    Pages: 1 – 11 | Full PDF Paper
  2. The Fuzzified Employability Model for the Perceived Multiple Intelligence of People with Epilepsy

    Siti Rahmah Awang, Rasimah Aripin, Md. Hanip Rafia, Tahir Ahmad

    Abstract: The focus of this paper is on the development of an employability model for People with Epilepsy (PWE). It describes the use of logistic regression to produce a crisp model and then fuzzy procedures are integrated into the crisp model to come up with a fuzzy model to be used to identify the optimal parameters of the eight intelligence skills. Next, the algorithms of the model were coded into C Sharp (C#) programming language to come up with the estimation of optimal combination of eight intelligences that improves the probability of being employed, P(Y=1).

    Keywords: Fuzzy model, Multiple Intelligence Theory, People with epilepsy.

    Pages: 12 – 27 | Full PDF Paper
  3. On Various Properties of δ-Compactness in Bitopological Spaces

    Sanjoy Kumar Biswas, Nasima Akhter

    Abstract: By introducing the notion of δ-compact Anjali Srivastava and Sandhya Gupta in paper (A. Srivastava and S. Gupta 2005) obtained the generalization of various results of Park in a paper (Herrington and Long 1975 and Park 1988). In this paper, we introduce the concept on various properties of δ-compactness in bitopological spaces.

    Keywords: H-closed spaces, net, ultranet, w-limit point, w-closure, δ-compact bitopological spaces, bitopological spaces, δ-Hausdorff bitopological spaces, θ-compactness.

    Pages: 28 – 40 | Full PDF Paper
  4. Teaching Statistics: School and Social Reality

    Võ Thi Lan


    Lenin once said that Statistics is one of the most powerful tools for social awareness. Statistics is an indispensable tool in the national economy. Managers rely on statistics in order to planning policies for economic development, given the factual basis for the management and operation of the business. No statistical information, government policies will lack factual basis which may lead to decision and policy mistakes.

    Statistical analysis is an important step indispensable in the fields of scientific research, especially experimental science. No statistical analysis, the study is not considered complete.

    In the analysis of corporate finance activities, economic policy analysis, macro-financial anallysis, statistical analysis models are scientific basis that provide more realistic in the formulation of management policies and business operation.

    There is no denying the significance of statistics and statistical contributions in the field of socio-economics. So, the statistical courses teaching and learning are needed to be properly awareness and these courses are designed to suit each learning object.

    Pages: 41 – 45 | Full PDF Paper