小妹请教有关Mauchly's Test of Sphericity的问题

是 否 +2 论坛币

k人 参与回答

经管之家送您一份

应届毕业生专属福利!

求职就业群

赵安豆老师微信：zhaoandou666

经管之家联合CDA

送您一个全额奖学金名额~ !

立即领取

感谢您参与论坛问题回答

经管之家送您两个论坛币！

+2 论坛币

大家好！
     我在做两因素重复测量时遇到一个问题，Mauchly's Test of Sphericity中的sig.没有值，是什么原因，对于下面的结果是否需要进行校正呢？

			Mauchly's Test of Sphericity(b)
						Epsilona
Within Subjects Effect	Mauchly's W	Approx. Chi-Square	df	sig.	Greenhouse-Geisser	Huynh-Feldt	Lower-bound
条件A	0.74	4.724	5	0.045	0.834	0.989	0.333
条件B	0	160.258	35	0	0.216	0.238	0.125
条件A * 条件B	0	.	299		0.287	0.503	0.042

Source		Type III Sum of Squares	df	F	Sig.	Partial Eta Squared
条件A * 条件B	Sphericity Assumed	22.012	24	2.03	0.003	0.107
	Greenhouse-Geisser	22.012	6.895	2.03	0.058	0.107
	Huynh-Feldt	22.012	12.083	2.03	0.023	0.107
	Lower-bound	22.012	1	2.03	0.172	0.107
Error(条件A * 条件B)	Sphericity Assumed	184.351	408
	Greenhouse-Geisser	184.351	117.208
	Huynh-Feldt	184.351	205.41
	Lower-bound	184.351	17

上面的数据结果,我们该看条件A
*
条件B的第一行的值(Sphericity
Assumed)还是第二行的值(Greenhouse-Geisser)?
谢谢了!

扫码加我 拉你入群

请注明：姓名-公司-职位

以便审核进群资格，未注明则拒绝

分享0 收藏0 回帖

关键词：Sphericity Mauchly City test Eric 测量 校正

观望中，我是外行。。。

没关系了，呵呵，还是很期待问题能够得到解决。在书上查不到，或者说不知道哪本书上有介绍，所以比较为难。

我也想知道哦

跟我遇到同样的问题..晕...

同问

我也不知咋回事，于是google了一下，发现估计是因为因素只有2个水平导致的。

Mauchly's test is assessing the condition of sphericity, which is when the variance of differences between levels of repeated measures factors are equal. It is a way of addressing assumptions about the structure of the covariance matrix in repeated measures designs.

If all your repeated measures factors have only two levels, there is only one covariance for each repeated measure. Therefore, the assumption about the covariance matrix is always met and a test of sphericity is not relevant. Unfortunately, the GLM command of SPSS appears to print the test of sphericity even under these conditions, which creates the confusion you seem to be having.

嗯 也认为如果因素水平小于3，球形度检验的结果就不显示。