Since survival time is a quantitative variable, why can’t we just use the usual techniques from Table I? Before we explain the main reason why we use survival analysis, let’ us consider a simple example on the survival times (in months) for 25 lung cancer patients who all died; the timings are : 1, 5, 6, 6, 9, 10, 10, 10, 12, 12, 12, 12, 12, 13, 15, 16, 20, 24, 24, 27, 32, 34, 36, 36, 44 months...

*These authors contributed equally to this work. 1 Department of Biostatistics, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA 2 Department of Biostatistics, Harvard School of Public Health, Boston, MA 02115, USA 3 Department of Genetics, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA 4 Department of Biostatistics and Center for Statisti...

6From the Department ofMedicine, University ofWestern Ontario, London, Ontario, and the Department ofPreventive Medicine and Biostatistics, University ofToronto, Toronto, Canada. tProfessor of Medicine. IProfessor and Chairman, Department of Preventive Medicine and Biostatistics. §Assistant Professor of Epidemiology and Biostatistics and of Medicine, University of Western Ontario. IIProject Man...

In this article, it was planned that we shall discuss Discriminant and Cluster analysis. While preparing the discussions for both topics, there was an overwhelming large amount of information and thus we shall concentrate on Discriminant analysis only and leave Cluster analysis to Biostatistics 304. Discriminant analysis (DA) was the traditional statistical technique used for differentiating gr...

In Cluster analysis, we seek to identify the “natural” structure of groups based on a multivariate profile, if it exists, which both minimises the within-group variation and maximises the between-group variation. The objective is to perform data reduction into manageable bite-sizes which could be used in further analysis or developing hypothesis concerning the nature of the data. It is explorat...

Correspondence to: Y H Chan Tel: (65) 6317 2121 Fax: (65) 6317 2122 Email: chanyh@ cteru.gov.sg INTRODUCTION Now we are at the last stage of the research process: Statistical Analysis & Reporting. In this article, we will discuss how to present the collected data and the forthcoming write-ups will highlight on the appropriate statistical tests to be applied. The terms Sample & Population; Param...

Beomseok Seoa*, Lin Linb & Jia Liaa Department of Statistics, The Pennsylvania State University, University Park, PA;b Biostatistics and Bioinformatics, Duke Durham, NC