Browsing Department of Statistics by Title

Now showing items 1-20 of 103

Adjusting for a cluster effect in the Logistic Regression Model : An illustration of theory and its application.

Jayatilleke, R.V.; Sooriyarachchi, M.R.; Senerathna, D.L.P. (National Science Foundation, Sri Lanka, 2011)

When a response having two outcomes is modelled using a logistic model the responses on each observation are often considered to be independent of each other. This assumption may not always be valid and the responses ...
Airline Seats Allocation Optimization Through Revenue Management

Saubhagya, K S; Wijesekara, W M L K N; Jayamanne, Imali T (Sri Lankan Journal of Applied Statistics, 2018)

Revenue Management has recently gained a solid recognition in Airline industry. It acts as a strategic and tactic provider to manage the uncertainty in demand for their perishable products in the most profitable manner as ...
Analyzing the Reliability of a Personal Computer System using Fault Tree Analysis

Rajapaksha, A.; Sunethra, A. A.; Sooriyarachchi, M.R. (2015)

A system can be defined as a set of components interconnected to perform a given task. Such a system has a high possibility of failure compared to a single component, since it is a combination of different components ...
Assessment of current status of ICT among households in Colombo district, Sri Lanka

Jegathesan, S.G.; Abeygunawardana, R.A.B. (University of Colombo, 2020)

ICT has become an inseparable component in the development of individuals and countries. This study focuses on Colombo district due to its importance to Sri Lanka, and investigates ICT device availability and its usage ...
Automated Statistical Information System (ASIS) for Diagnosis and Prognosis of Life-threatening Viral Diseases.

Ratnayake, G.I.; Sooriyarachchi, M.R. (IASSL, 2014)

Diagnosis of life-threatening viral diseases, such as Meningitis, Viral Hepatitis, Japanese Encephalitis, Dengue, Leptospirosis (Rat Fever) to name a few, is extremely challenging particularly in low-resource settings, ...
Bivariate Test for testing the average areas under correlated receiver operating characteristic curves

Seneratna, D.; Sooriyarachchi, M.R.; Meyen, A.N. (2015)

Methodology developed for comparing correlated ROC curves are mainly based on nonparametric methods. These nonparametric methods have several disadvantages. In this paper the authors propose an asymptotic bivariate test ...
A case study on final inspection result in garment products

Kahatapitiya, J.B.; Bandara, E.R.A.D. (University of Colombo, 2020)

Quality can be expressed as one of the key factors of business sustainability in the apparel industry. There are several quality controlling mechanisms to ensure product quality. Final inspections, which is the final ...
Comparability of the Effect of Re-Scrutinizing on Two University Selection Methods, ZScore and Common Currency Index (CCI) Method in Sri Lanka

Yatapana, P.S.; Sooriyarachchi, M.R. (2018)

The CCI Method was mathematically and statistically tested and proved as an improved method to the current university selection method, ZScore. Education of Sri Lanka is entirely free and students are selected to limited ...
A comparative study of generalized linear mixed modelling and artificial neural network approach for the joint modelling of survival and incidence of Dengue patients in Sri Lanka

Hapudoda, J.; Sooriyarachchi, M.R. (IOP e-Books, 2017)

Survival time of patients with a disease and the incidence of that particular disease (count) is frequently observed in medical studies with the data of a clustered nature. In many cases, though, the survival times and ...
Comparison of association rule mining performances: market basket analysis of a mini supermarket

Hussain, F.S.; Viswakula, S.D. (University of Colombo, 2020)

Market Basket Analysis discovers consumer purchasing patterns by identifying important and interesting association rules among the products bought in a shopping basket. This field of study is not only useful in the ...
A comparison of Bayesian Markov chain Monte Carlo methods in a multilevel scenario

Rasan, Darshika; Sooriyarachchi, M.R.; Pinto, Vimukthini (Taylor and Francis, 2021)

Multilevel modeling is a modern approach to deal with hierarchical or a nested data structure which can assess the variability between clusters. Bayesian Markov Chain Monte Carlo (MCMC) methods of estimations are advanced ...
Comparison of methods for analyzing binary repeated measures data: A simulation-based study comparison of methods for binary repeated measures

Gawarammana, M. B. M. B. K.; Sooriyarachchi, M.R. (Taylor and Francis, 2017)

Binary Repeated Measures (BRM), Weighted Least Squares (WLS), Generalized Estimating Equation (GEE), Generalized Linear Mixed Models (GLMMs), Simulation Study, SAS
Comparison of methods of estimation for a goodness of fit test – an analytical and simulation study

Pinto, Vimukthini; Sooriyarachchi, M.R. (Taylor and Francis, 2021)

Multilevel modelling is a novel approach to analyse data which consist of a hierarchical or a nested structure. With advancements in multilevel modelling, there has been an advancement in the estimation techniques and ...
Comparison of Methods of Estimation for Use in Goodness of Fit Tests for Binary Multilevel Models

Pinto, V.; Sooriyarachchi, M.R. (World Academy of Science, 2019)

It can be frequently observed that the data arising in our environment have a hierarchical or a nested structure attached with the data. Multilevel modelling is a modern approach to handle this kind of data. When ...
A comparison of model parameter estimation methods for complex survey survival data

Jayamanne, IT; Ramanayake, A; Jayatilake, RV (Journal of the National Science Foundation of Sri Lanka, 2023)

When estimation of model parameters is the target in survey data, the inference on the model can be based on a pure model-based approach or a model-assisted approach which is a hybrid approach combining design-based and ...
Competing Risk Model for Dengue Epidemiology in Sri Lanka : Modeling Length of Stay in Hospital

Karunarathna, G.H.S.; Sooriyarachchi, M.R. (2017)

This paper focuses on exploring methods for analyzing length of stay in hospital and the discharge endpoint for dengue patients reported from high risk areas of Sri Lanka during the period of 2006-2008. Due to the length ...
Compliance for single and multiple dose regimes of superactivated charcoal: a prospective study of patients in a clinical trial

Mohamad, F.; Sooriyarachchi, M.R.; Senarathna, L.; Azhar, S.; Sheriff, M.H.R.; Buckley, N.A.; Eddleston, M. (2007)

Background. Although activated charcoal is widely used for the treatment of self-poisoning, its effectiveness is unknown. An important consideration is patient compliance since poor compliance will limit effectiveness. ...
Design and analysis techniques for many-to-many matched case-control studies: An illustration using the Ille-et-Vilaine database for esophageal cancer

Kuruppumullage, P.; Sooriyarachchi, M.R. (2007)

Case-control studies, that investigate combinations of circumstances causing many diseases is largely in practice in many real world situations. Matching in case-control studies adjust for the effects of confounding variables ...
A detailed analysis of a genotype-environment study on rice in Sri Lanka

Wickramasinghe, W.M.P.M.; Wickremasinghe, W.N.; Abeygunawardana, R.A.B. (2011)

Genotype × Environment (variety × location) interactions are very important in variety trials repeated over different locations. The presence of interaction suggests that recommendation of varieties must be done according ...
Determining the Sensitivity and Specificity of a Substitute Test as a Diagnostic for its Gold Standard in the presence of Severe Missingness.

Senerathne, D.M.; Sooriyarachchi, M.R. (National Science Foundation, Sri Lanka, 2012)

When the need arises to identify a disease, substitute tests or screening tests are commonly used to recommend patients for its respective “Gold Standard”. Since it is seldom that these gold standards are carried out ...

Now showing items 1-20 of 103

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