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Statistics
1. Modelling of Correlated Ordinal Responses, by Using Multivariate Skew Probit with Different Types of Variance Covariance Structures

Mohammad Reza Zadkarami; Mohammad Reza ghalani

Volume 30, Issue 4 , Autumn 2019, , Pages 363-369

http://dx.doi.org/10.22059/jsciences.2019.260615.1007285

Abstract
  In this paper, a multivariate fundamental skew probit (MFSP) model is used to model correlated ordinal responses which are constructed from the multivariate fundamental skew normal (MFSN) distribution originate to the greater flexibility of MFSN. To achieve an appropriate VC structure for reaching reliable ...  Read More

Statistics
2. Liu Estimates and Influence Analysis in Regression Models with Stochastic Linear Restrictions and AR (1) Errors

Hoda Mohammadi; Abdolrahman Rasekh

Volume 30, Issue 3 , Summer 2019, , Pages 271-285

http://dx.doi.org/10.22059/jsciences.2019.275988.1007375

Abstract
  In the linear regression models with AR (1) error structure when collinearity exists, stochastic linear restrictions or modifications of biased estimators (including Liu estimators) can be used to reduce the estimated variance of the regression coefficients estimates. In this paper, the combination of ...  Read More

Statistics
3. Strong Convergence Rates of the Product-limit Estimator for Left Truncated and Right Censored Data under Association

Amir Hossin Shabani; Hadi Jabbari Nooghabi; Vahid Fakoor

Volume 30, Issue 2 , Spring 2019, , Pages 177-185

http://dx.doi.org/10.22059/jsciences.2019.262991.1007303

Abstract
  Non-parametric estimation of a survival function from left truncated data subject to right censoring has been extensively studied in the literature. It is commonly assumed in such studies that the lifetime variables are a sample of independent and identically distributed random variables from the target ...  Read More

Statistics
4. Genetic-Fuzzy Data Envelopment Analysis Model for Evaluating Financial Institutions Relative Productivity in a Fluctuating Economic Market

Veronica Ijebusomma Osubor; Francis Imouokhome; Joy Okoh

Volume 30, Issue 1 , Winter 2019, , Pages 77-86

http://dx.doi.org/10.22059/jsciences.2019.69634

Abstract
  This paper presents a Genetic Algorithm Fuzzy Data Envelopment Analysis (GA-FDEA) model that caters for optimal selecting of economic indicators for the measurement of relative productivity and performance of financial institutions. Imprecise or uncertain data of financial institutions due to varying ...  Read More