摘要: Poisson distribution is a common type of discrete random variable distribution.It is mainly used to d[阅读全文:]
摘要: Binomal distribution is a basic distribution of a discrete random variable,if an observation has two[阅读全文:]
摘要: Standardization can eliminate the influence of population composition in different samples,making the[阅读全文:]
摘要: measurementsapplicationscentral tendencyarithmetic meanSymmetrical distribution, especi[阅读全文:]
摘要: The statistical measures of central tendency include arithmetic mean,geometric mean,median. The[阅读全文:]
摘要: Randomization refers to random sampling,random allocation and random test sequence.[阅读全文:]
摘要: 历史资料分析，是通过回顾性调查，提取和利用相关机构的日常工作的记录、登记、各类日常报告、统计表格、疾病记录档案等历史资料，进一步开展统计分析，最终获得研究结果。[阅读全文:]
摘要: 个案研究(case study)，又称个案调查，是运用流行病学的原理和方法，到发病现场对新发病例的接触史、家属及周围人群的发病或健康状况以及与发病可能有关的环境因素进行调查。[阅读全文:]
摘要: 病例报告(case report)，是对临床上某种罕见病的单个病例或少数病例的详细介绍，属于定性研究的范畴。[阅读全文:]
摘要: 响应度（Responsiveness）又称反应度、敏感度, 是量表考评的一个指标，指内外环境变化时,若被测对象有所变化, 则测量结果必须敏感地对此变化作出反应。[阅读全文:]
