几种常见的显著性检验方法
(John Wilder Tukey) test 最著名的有 2 个:
(1) Tukey test for multiple comparisons
主要应用于3组或以上的多重比较。比如说一几种常见的显著性检验方法
(John Wilder Tukey) test 最著名的有 2 个:
(1) Tukey test for multiple comparisons
主要应用于3组或以上的多重比较。比如说一共有4组数据,两两比较产生6个统计 值,Tukey-test 用于生成一个 critical value 来控制总体误差(Family wise error rate,FER),与Tukey test相类似的是Dunnett test,它是控制多对一比较(即3组同 时和一个参照组比较)的FER。 (2)Tukey trend test
主要用于检验同一药物不同剂量下和参照药物的线性关系。Tukey trend test简单但 及其高效,是生物统计学常用的方法。-test
T检验,,当时他以“ Student”为笔名发表, 故至今有的书籍仍称之为“学生氏检验”。t可能是倍数的意思(times),t就是样本均数 SX(x)与总体均数(“)间相距几倍标准误(sx)。t检验是用于比较两均数间相差是否显著的。
t检验过程:是对两样本均数(mean)差别的显著性进行检验。唯t检验须知道两个总 体的方差(Variances)是否相等;t检验值的计算会因方差是否相等而有所不同。也就是说, t检验须视乎方差齐性(Equality of Variances)结果。所以,SPSS在进行t-test for Equality of Means 的同时,也要做 Levene's Test for Equality of Variances。
3. Dunn’s multiple comparison test
Dunn's test calculates a P value for each pair of columns. These P values answer this question: If the data were sampled from populations with the same median, what is the chance that one or more pairs of columns would have medians as far apart as observed here? If the P value is low, you'll conclude that the difference is statistically significant. The calculation of the P value takes into account the number of comparisons you are making. If the null hypothesis is true (all data are sampled from populations with identica
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