Papers by Uditha Balasooriya
North American Actuarial Journal, 2008
Journal of Statistical Computation and Simulation, 2007
We consider the problem of designing variables-sampling plans for life testing. Leiberman and Res... more We consider the problem of designing variables-sampling plans for life testing. Leiberman and Resnikoff, Schneider and many others have considered this problem for location-scale type lifetime distributions. However, in practice, the actual lifetime distribution is often unknown. In this article, we propose a procedure based on order statistics for designing a reliability sampling plan which is applicable to any lifetime distribution. It is shown that, under the proposed procedure, subject to MIL-STD-105D specifications, only a few specimens need to be tested until failure, thereby reducing total test time considerably. A large-scale simulation study shows that the proposed procedure performs well. Two examples are given to illustrate the procedure.
IEEE Transactions on Reliability, 2004
J Appl Stat, 1994
A method based on the prediction of order statistics is proposed to select the underlying parent ... more A method based on the prediction of order statistics is proposed to select the underlying parent distribution. A cross-validatory predictor and the best linear unbiased predictor are considered in choosing between gamma and Weibull models when shape parameters are only known to lie within a range. The proposed approach is evaluated using a large-scale Monte Carlo study. The results clearly show that the cross-validatory predictor performs well as a robust procedure in selecting between probability densities. Two well-known data sets are used to illustrate the procedure.
Authors would like to thank an anonymous referee of the journal for useful comments that led to a... more Authors would like to thank an anonymous referee of the journal for useful comments that led to a substantially revised paper.
Journal of Statistical Computation and Simulation, Jul 1, 2003
This paper is concerned with properties (bias, standard deviation, mean square error and efficien... more This paper is concerned with properties (bias, standard deviation, mean square error and efficiency) of twenty six estimators of the intraclass correlation in the analysis of binary data. Our main interest is to study these properties when data are generated from different ...
Metron International Journal of Statistics, Feb 1, 1999
Http Dx Doi Org 10 1081 Sta 120015010, Feb 15, 2007
Australian Senior Mathematics Journal, 2012
F or any density function (or probability function), there always corresponds a cumulative distri... more F or any density function (or probability function), there always corresponds a cumulative distribution function (cdf). It is a well-known mathematical fact that the cdf is more general than the density function, in the sense that for a given distribution the former may exist without the existence of the latter. Nevertheless, while the density function curve is frequently adopted as a graphical device in depicting the main attributes of the distribution it represents, the cdf curve is usually ignored in such practical analysis.
Http Dx Doi Org 10 1080 00949659408811614, Mar 20, 2007
ABSTRACT
Authors would like to thank an anonymous referee of the journal for useful comments that led to a... more Authors would like to thank an anonymous referee of the journal for useful comments that led to a substantially revised paper.
Insurance: Mathematics and Economics, 2015
ABSTRACT
Insurance: Mathematics and Economics, 2015
ABSTRACT
Insurance: Mathematics and Economics, 2014
ABSTRACT
Technometrics, 2000
... edu.sg) Veeresh GADAG Division of Community Medicine, Faculty of Medicine, and Department of ... more ... edu.sg) Veeresh GADAG Division of Community Medicine, Faculty of Medicine, and Department of Mathematics and Statistics Memorial University of Newfoundland St. ... 161 + 1) g9(i,Yn)[G(yi, n,)], Page 3. UDITHA BALASOORIYA, SUTAIP LC SAW, AND VEERESH GADAG 0 1n? ...
Statistics in Medicine, 2004
A procedure for testing for treatment effect in data similar to the data on premature ventricular... more A procedure for testing for treatment effect in data similar to the data on premature ventricular contractions (PVC) is presented. We consider a zero-inflated beta-binomial model. Based on this model, we develop score tests to test for treatment effect in the data in which observations in the form of counts are recorded before and after applying a therapy. Results of a small simulation experiment, to study small sample behaviour of a score test and a likelihood ratio test, are reported and the PVC data are analysed. Both the score and the likelihood ratio tests show good level properties. Either the score tests or the likelihood ratio tests can be used for testing the presence of treatment effect. The score tests, however, may be preferable because they use estimates of the parameters only under the null hypothesis and in the important range pi<0.5 power of the score test statistic S1 is slightly better than the likelihood ratio statistic LR1.
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Papers by Uditha Balasooriya