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Pushpakanthie Wijekoon

Publications (3)

Modeling Count Data from Dependent Clusters with Poisson Mixed Models

K. A. N. K. Karunarathna & Pushpakanthie Wijekoon · Asian Journal of Probability and Statistics · 2018

Responses collected from dependent clusters are affected by the dependence among clusters and it should be taken into account in modeling such responses. In this study, a new approach was evaluated to incorporate cluster dependence in generalized linear Poisson mixed models for c...

Open access Research Article 10.9734/ajpas/2018/v1i224505

Ridge Estimator in Logistic Regression under Stochastic Linear Restrictions

Nagarajah Varathan & Pushpakanthie Wijekoon · Journal of Advances in Mathematics and Computer Science · 2016

In the logistic regression, it is known that multicollinearity affects the variance of Maximum Likelihood Estimator (MLE). To overcome this issue, several researchers proposed alternative estimators when exact linear restrictions are available in addition to sample model. In this...

Open access Research Article 10.9734/BJMCS/2016/24585

Preliminary Test Stochastic Restricted r-k Class Estimator and Preliminary Test Stochastic Restricted r-d Class Estimator in Linear Regression Model

Sivarajah Arumairajan & Pushpakanthie Wijekoon · Journal of Advances in Mathematics and Computer Science · 2014

In this study two new preliminary test stochastic restricted estimators, a Preliminary Test stochastic restricted r-k class estimator and a Preliminary Test stochastic restricted r-d class estimator, are proposed. The comparison of one estimator over the other is done in the mean...

Open access Research Article 10.9734/BJMCS/2015/13781