1、Medical Statistics (full English class)Ji-Qian FangSchool of Public Health Sun Yat-Sen UniversityIntroduction to Medical StatisticsStatistics :l The discipline concerned with the treatment of numerical data derived from groups of individuals (P. Armitage).l The science and art of dealing with variat
2、ion in data through collection, classification and analysis in such a way as to obtain reliable results ( JM Last).l Medical Statistics: Application of mathematical statistics inthe field of medicinel Why we need to study statistics?Three reasons:(1)Basic requirement of medical research.(2)Update yo
3、ur medical knowledge.(3) Management and treatment for your owndata.Basic conceptsl Homogeneity: All individuals have similar characteristics and belong to same category.l Variation: the differences in some features such as height, weight1. Homogeneity and Variationl Population: The whole collection
4、ofindividuals that one intends to study- Homogeneity but with Variationl Sample: A representative part of thepopulation.l Randomization: An important way to make the sample representative.2. Population and sampleRandomBy chance!l Random event: the event may occur or may not occur in one experiment. Before an experiment, nobody is surewhether the event occurs or not. l However, there must be some regulation in a large number of experiments.
