摘要
目的探讨玻璃折射率数据处理方法。方法将案件中收集到的45个玻璃样品和同一个车灯不同部位的45块玻璃样品进行折射率测定。用独立样本Student's t检验、Welch检验以及方差分析(ANOVA)对数据进行成对检验。结果方差分析法中DunnettsC法处理玻璃折射率数据,有效控制了第一类和第二类错误。当α=0.05时,犯第一类错误的概率约为4.44%,犯第二类错误的概率约为3.54%。
Refractive index （RI） of 45 glass samples collected from case work in recent 3 years and 45 glass fragments from one headlight were measured by oil immersion method. Student＇s t ,Welch test and analysis of variance（ANOVA）were applied to all pairwise comparisons. The Dunnett＇s C method in ANOVA analysis controlled type I and type Ⅱ errors much better than Student＇s t and Welch test, giving type Ⅰ error at level about 4.44% and typeⅡ error at about 3.54 %.
出处
《刑事技术》
2009年第3期10-13,共4页
Forensic Science and Technology
关键词
玻璃物证
玻璃折射率
成对检验
glass samples
refractive index
pairwise examination
