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(摘自金正均:医学试验设计原理,96～97页,上海科技出版社,上海,1964。)这里仅将各主要统计方法的应用加以介绍。[定性资料]是用绝对比或百分比表达的资料。欲知两组差别是否显著,可用t法,或x~2试验。关于x~2试验在医学中的应用,历来有不少人推荐(E. Greeuwood: JAMA 143:1260, 1950. Hawkins: JAMA 175:236,1961.)。这个方法较不灵敏,所以能达5 % 的显著水平便够了。个体数很少的定性资料难于比较,一般可用
(From Kim Jung-joon: Principles of Medical Trial Design, 96-97, Shanghai Science and Technology Press, Shanghai, 1964.) Here, the application of each major statistical method is introduced. Qualitative data is data expressed in absolute ratios or percentages. To know if the difference between the two groups is significant, t-test or x~2 test can be used. The use of x~2 trials in medicine has been recommended by many people (E. Greeuwood: JAMA 143:1260, 1950. Hawkins: JAMA 175:236, 1961.). This method is less sensitive, so reaching a 5% level of significance is enough. Qualitative data with a small number of individuals is difficult to compare and is generally available